diff --git a/.vscode/launch.json b/.vscode/launch.json
index 279cc62..22ae4d4 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -10,7 +10,7 @@
             "request": "launch",
             "program": "${workspaceRoot}/fmtidx",
             "args": [
-                "/mnt/d/data/reference/human_g1k_v37_decoy.fasta"
+                "/home/zzh/reference/human_g1k_v37_decoy.fasta"
             ],
             "cwd": "${workspaceFolder}", // 当前工作路径：当前文件所在的工作空间
         }
diff --git a/bwt.cpp b/bwt.cpp
index 5454d1e..5ed0cb9 100644
--- a/bwt.cpp
+++ b/bwt.cpp
@@ -354,7 +354,7 @@ bwtintv_t bwt_search2(bwt_t *bwt, const string &q)
 
     bwt_set_intv(bwt, bval(q[x]), ik);
     ik.info = x + 1;
-    // cout << "bwt-2: " << ik.x[0] << '\t' << ik.x[1] << '\t' << ik.x[2] << endl;
+    //cout << "bwt-2: " << ik.x[0] << '\t' << ik.x[1] << '\t' << ik.x[2] << endl;
 
     for (i = x + 1; i + 1 < (int)q.size(); i += 2)
     {
diff --git a/fmt_index.cpp b/fmt_index.cpp
index 3cb1def..30114ac 100644
--- a/fmt_index.cpp
+++ b/fmt_index.cpp
@@ -8,6 +8,7 @@
 #include <algorithm>
 #include <string.h>
 #include <immintrin.h>
+#include <sstream>
 
 #include "util.h"
 #include "bwt.h"
@@ -203,12 +204,16 @@ FMTIndex *create_fmt_from_bwt(bwt_t *bwt)
 	fmt->bwt_size += n_occ * 20; // A,C,G,T和AA,AC.....TG,TT共20个
 
 #ifdef FMT_MID_INTERVAL
+	uint32_t s1;
 	bwtint_t mn_occ = (bwt->seq_len >> FMT_OCC_INTV_SHIFT) * (FMT_OCC_INTERVAL / FMT_MID_INTERVAL - 1);
 	bwtint_t last_seq_len = bwt->seq_len % FMT_OCC_INTERVAL;
 	mn_occ += (last_seq_len + FMT_MID_INTERVAL - 1) / FMT_MID_INTERVAL - 1;
 	fmt->bwt_size += mn_occ * 4;
-	//cout << "mn_occ: " << mn_occ << endl;
-	//exit(0);
+	cout << (FMT_OCC_INTERVAL / FMT_MID_INTERVAL - 1) << ' ' << last_seq_len << ' ' << (last_seq_len + FMT_MID_INTERVAL - 1) / FMT_MID_INTERVAL - 1 << endl;
+	cout << "mn_occ: " << mn_occ << ' ' << mn_occ * 4 << endl;
+	i = 0;
+	//cout << ((i + 16 & FMT_MID_INTV_MASK) == 0) << endl;
+	// exit(0);
 #endif
 
 	buf = (uint32_t *)calloc(fmt->bwt_size, 4); // 开辟计算fmt用到的缓存
@@ -304,47 +309,35 @@ FMTIndex *create_fmt_from_bwt(bwt_t *bwt)
 
 			if (j > 8)
 			{
-
-#if FMT_MID_INTERVAL == 8
-				for (m = 0; m < 4; ++m)
-				{
-					uint32_t s1 = pre_and_bwt_seq;
-					mc[m] += cnt_table[m][s1 & 0xff] + cnt_table[m][s1 >> 8 & 0xff] + cnt_table[m][s1 >> 16 & 0xff] + cnt_table[m][s1 >> 24];
-					buf[k++] = mc[m];
-				}
-#endif
 				for (m = 8; m > 0; --m)
 				{
 					int lshift_bit = 2 * m - 2;
 					pre_and_bwt_seq_2 |= (((pre_bwt_16_seq & (3 << lshift_bit)) << (m * 2)) | ((bwt_16_seq & (3 << lshift_bit)) << (m * 2 - 2)));
 				}
-				buf[k++] = pre_and_bwt_seq_2;
+
+#ifdef FMT_MID_INTERVAL
+				s1 = pre_and_bwt_seq;
+				for (m = 0; m < 4; ++m)
+					mc[m] += cnt_table[m][s1 & 0xff] + cnt_table[m][s1 >> 8 & 0xff] + cnt_table[m][s1 >> 16 & 0xff] + cnt_table[m][s1 >> 24];
+#endif
 
 #if FMT_MID_INTERVAL == 8
-				if ((i + 16) % FMT_OCC_INTERVAL != 0 && j == 16)
-					for (m = 0; m < 4; ++m)
-					{
-						uint32_t s1 = pre_and_bwt_seq_2;
-						mc[m] += cnt_table[m][s1 & 0xff] + cnt_table[m][s1 >> 8 & 0xff] + cnt_table[m][s1 >> 16 & 0xff] + cnt_table[m][s1 >> 24];
-						buf[k++] = mc[m];
-					}
-#endif
-			}
-#if FMT_MID_INTERVAL == 16
-			// 加入中间的check point
-			for (m = 0; m < 4; ++m)
-			{
-				uint32_t s1 = pre_and_bwt_seq;
-				mc[m] += cnt_table[m][s1 & 0xff] + cnt_table[m][s1 >> 8 & 0xff] + cnt_table[m][s1 >> 16 & 0xff] + cnt_table[m][s1 >> 24];
-				s1 = pre_and_bwt_seq_2;
-				mc[m] += cnt_table[m][s1 & 0xff] + cnt_table[m][s1 >> 8 & 0xff] + cnt_table[m][s1 >> 16 & 0xff] + cnt_table[m][s1 >> 24];
-			}
-			if ((i + 16) % FMT_OCC_INTERVAL != 0 && j > 8) // 序列最后的部分不用保存
-			{
 				for (m = 0; m < 4; ++m)
 					buf[k++] = mc[m];
-			}
 #endif
+
+				buf[k++] = pre_and_bwt_seq_2;
+
+#ifdef FMT_MID_INTERVAL
+				s1 = pre_and_bwt_seq_2;
+				for (m = 0; m < 4; ++m)
+					mc[m] += cnt_table[m][s1 & 0xff] + cnt_table[m][s1 >> 8 & 0xff] + cnt_table[m][s1 >> 16 & 0xff] + cnt_table[m][s1 >> 24];
+
+				if ((i + 16) % FMT_OCC_INTERVAL != 0 && j == 16 && ((i + 16) & FMT_MID_INTV_MASK) == 0)
+					for (m = 0; m < 4; ++m)
+						buf[k++] = mc[m];
+#endif
+			}
 		}
 	}
 	// the last element
@@ -354,6 +347,7 @@ FMTIndex *create_fmt_from_bwt(bwt_t *bwt)
 	k += 16;
 	// cout << "n occ: " << n_occ << endl;
 	cout << "size: " << k << '\t' << fmt->bwt_size << endl;
+	// exit(0);
 	xassert(k == fmt->bwt_size, "inconsistent bwt_size");
 	// update fmt
 	fmt->bwt = buf;
@@ -386,7 +380,7 @@ void fmt_e2_occ(const FMTIndex *fmt, bwtint_t k, int b1, int b2, bwtint_t cnt[4]
 	cnt[3] = q[b2]; // b2的occ
 	p += 20;
 
-#ifdef FMT_MID_INTERVAL
+#ifdef FMT_MID_INTERVAL // 加入了middle checkpoint
 	// 使用mid interval信息
 	int mk = k % FMT_OCC_INTERVAL;
 	int n_mintv = mk >> FMT_MID_INTV_SHIFT;
@@ -405,29 +399,34 @@ void fmt_e2_occ(const FMTIndex *fmt, bwtint_t k, int b1, int b2, bwtint_t cnt[4]
 		x = 0;
 		p += 4;
 	}
-#if FMT_MID_INTERVAL == 16
+#if FMT_MID_INTERVAL == 16 // middle check point interval等于16时候，只需要判断一下是不是要计算两个uint32表示的碱基序列
 	if ((mk & FMT_MID_INTV_MASK) >> 3)
 	{
 		x += __fmt_occ_e2_aux2(fmt, ti, *p);
 		++p;
 	}
 #elif FMT_MID_INTERVAL > 16 // 该地址是bwt和pre_bwt字符串数据的首地址
-	uint32_t *end = p + ((k >> 3) - ((k & ~FMT_OCC_INTV_MASK) >> 3));
+	uint32_t *end = p + ((k >> 3) - ((k & ~FMT_MID_INTV_MASK) >> 3));
 	for (; p < end; ++p)
 	{
 		x += __fmt_occ_e2_aux2(fmt, ti, *p);
 	}
-	tmp = *p & ~((1U << ((~k & 7) << 2)) - 1);
-	x += __fmt_occ_e2_aux2(fmt, ti, tmp);
 #endif
-#else
+#else // 没有加入middle check point interval
+#if FMT_OCC_INTERVAL > 16
 	uint32_t *end = p + ((k >> 3) - ((k & ~FMT_OCC_INTV_MASK) >> 3));
+	// p = end - (end - p) / 4;
 	for (; p < end; ++p)
 	{
 		x += __fmt_occ_e2_aux2(fmt, ti, *p);
 	}
-	tmp = *p & ~((1U << ((~k & 7) << 2)) - 1);
-	x += __fmt_occ_e2_aux2(fmt, ti, tmp);
+#else // FMT_OCC_INTERVAL等于16的时候，只需要判断一次就可以
+	if ((k & FMT_OCC_INTV_MASK) >> 3)
+	{
+		x += __fmt_occ_e2_aux2(fmt, ti, *p);
+		++p;
+	}
+#endif
 #endif
 	tmp = *p & ~((1U << ((~k & 7) << 2)) - 1);
 	x += __fmt_occ_e2_aux2(fmt, ti, tmp);
@@ -452,119 +451,13 @@ void fmt_e2_occ(const FMTIndex *fmt, bwtint_t k, int b1, int b2, bwtint_t cnt[4]
 	cnt[3] += x >> 24 & 0xff;
 }
 
-void calc_intv_occ(const FMTIndex *fmt, bwtint_t k, bwtint_t str_line, bwtint_t cp_line,
-						  uint32_t *p, int b1, int b2, bwtint_t cnt[4])
-{
-
-	uint32_t x = 0;
-	uint32_t *q, tmp;
-	int i, ti = b1 << 2 | b2;
-#ifdef FMT_MID_INTERVAL
-	// 使用mid interval信息
-	int mk = k % FMT_OCC_INTERVAL;
-	int n_mintv = mk >> FMT_MID_INTV_SHIFT;
-	if (n_mintv > 0) // 至少超过了第一个mid interval
-	{
-		p += n_mintv * (4 + (FMT_MID_INTERVAL >> 3)) - 4; // 对应的mid interval check point的首地址，即A C G T的局部累积量
-		q = p + b1;
-		for (i = b1 + 1; i < 4; ++i)
-			x += p[i]; // 大于b1的碱基的occ之和
-		cnt[0] += __fmt_mid_sum(x);
-		x = *q;
-		cnt[1] += __fmt_mid_sum(x); // b1的occ
-		for (i = 3; i > b2; --i)
-			cnt[2] += x >> (i << 3) & 0xff; // 大于b2的occ之和
-		cnt[3] += x >> (b2 << 3) & 0xff;	// b2的occ
-		x = 0;
-		p += 4;
-	}
-#if FMT_MID_INTERVAL == 16
-	if ((mk & FMT_MID_INTV_MASK) >> 3)
-	{
-		x += __fmt_occ_e2_aux2(fmt, ti, *p);
-		++p;
-	}
-#elif FMT_MID_INTERVAL > 16 // 该地址是bwt和pre_bwt字符串数据的首地址
-	uint32_t *end = p + ((k >> 3) - ((k & ~FMT_OCC_INTV_MASK) >> 3));
-	for (; p < end; ++p)
-	{
-		x += __fmt_occ_e2_aux2(fmt, ti, *p);
-	}
-	tmp = *p & ~((1U << ((~k & 7) << 2)) - 1);
-	x += __fmt_occ_e2_aux2(fmt, ti, tmp);
-#endif
-#else
-	uint32_t *end = p + ((k >> 3) - ((k & ~FMT_OCC_INTV_MASK) >> 3));
-	for (; p < end; ++p)
-	{
-		x += __fmt_occ_e2_aux2(fmt, ti, *p);
-	}
-	tmp = *p & ~((1U << ((~k & 7) << 2)) - 1);
-	x += __fmt_occ_e2_aux2(fmt, ti, tmp);
-#endif
-	tmp = *p & ~((1U << ((~k & 7) << 2)) - 1);
-	x += __fmt_occ_e2_aux2(fmt, ti, tmp);
-
-	if (b1 == 0)
-	{
-		x -= (~k & 7) << 8;
-		if (b2 == 0)
-			x -= (~k & 7) << 24;
-	}
-	// 如果跨过了second_primary,那么可能需要减掉一次累积值
-	if (b1 == fmt->first_base && cp_line < fmt->sec_primary && str_line >= fmt->sec_primary)
-	{
-		if (b2 < fmt->last_base)
-			cnt[2] -= 1;
-		else if (b2 == fmt->last_base)
-			cnt[3] -= 1;
-	}
-	cnt[0] += x & 0xff;
-	cnt[1] += x >> 8 & 0xff;
-	cnt[2] += x >> 16 & 0xff;
-	cnt[3] += x >> 24 & 0xff;
-}
-
-void fmt_e2_2occ(const FMTIndex *fmt, bwtint_t k, bwtint_t l, int b1, int b2, bwtint_t tk[4], bwtint_t tl[4])
-{
-    bwtint_t _k, _l;
-    _k = k - (k >= fmt->primary);
-    _l = l - (l >= fmt->primary);
-    if (_l >> FMT_OCC_INTV_SHIFT != _k >> FMT_OCC_INTV_SHIFT || k == (bwtint_t)(-1) || l == (bwtint_t)(-1))
-    {
-		fmt_e2_occ(fmt, k, b1, b2, tk);
-		fmt_e2_occ(fmt, l, b1, b2, tl);
-	}
-    else
-    {
-		uint32_t *p, *q;
-		bwtint_t cp_line = _k >> FMT_OCC_INTV_SHIFT << FMT_OCC_INTV_SHIFT;
-		int i;
-		tk[0] = 0;
-		tk[2] = 0;
-		p = fmt_occ_intv(fmt, _k);
-		for (i = b1 + 1; i < 4; ++i)
-			tk[0] += p[i]; // 大于b1的碱基的occ之和
-		tk[1] = p[b1];		// b1的occ
-		q = p + 4 + b1 * 4;
-		for (i = b2 + 1; i < 4; ++i)
-			tk[2] += q[i]; // 大于b2的occ之和
-		tk[3] = q[b2];		// b2的occ
-		p += 20;
-		memcpy(tl, tk, 32);
-		calc_intv_occ(fmt, _k, k, cp_line, p, b1, b2, tk);
-		calc_intv_occ(fmt, _l, l, cp_line, p, b1, b2, tl);
-	}
-}
-
 // 扩展两个碱基
 void fmt_extend2(const FMTIndex *fmt, bwtintv_t *ik, bwtintv_t *ok, int is_back, int b1, int b2)
 {
 	bwtint_t tk[4], tl[4], first_pos;
 	// tk表示在k行之前所有各个碱基累积出现次数，tl表示在l行之前的累积
-	//fmt_e2_occ(fmt, ik->x[!is_back] - 1, b1, b2, tk);
-	//fmt_e2_occ(fmt, ik->x[!is_back] - 1 + ik->x[2], b1, b2, tl);
-	fmt_e2_2occ(fmt, ik->x[!is_back] - 1, ik->x[!is_back] - 1 + ik->x[2], b1, b2, tk, tl);
+	fmt_e2_occ(fmt, ik->x[!is_back] - 1, b1, b2, tk);
+	fmt_e2_occ(fmt, ik->x[!is_back] - 1 + ik->x[2], b1, b2, tl);
 
 	//fmt_e2_occ_2way(fmt, ik->x[!is_back] - 1, b1, b2, tk);
 	//fmt_e2_occ_2way(fmt, ik->x[!is_back] - 1 + ik->x[2], b1, b2, tl);
@@ -587,9 +480,8 @@ void fmt_extend1(const FMTIndex *fmt, bwtintv_t *ik, bwtintv_t *ok, int is_back,
 	bwtint_t tk[4], tl[4];
 	int b2 = 3;
 	// tk表示在k行之前所有各个碱基累积出现次数，tl表示在l行之前的累积
-	//fmt_e2_occ(fmt, ik->x[!is_back] - 1, b1, b2, tk);
-	//fmt_e2_occ(fmt, ik->x[!is_back] - 1 + ik->x[2], b1, b2, tl);
-	fmt_e2_2occ(fmt, ik->x[!is_back] - 1, ik->x[!is_back] - 1 + ik->x[2], b1, b2, tk, tl);
+	fmt_e2_occ(fmt, ik->x[!is_back] - 1, b1, b2, tk);
+	fmt_e2_occ(fmt, ik->x[!is_back] - 1 + ik->x[2], b1, b2, tl);
 	//fmt_e2_occ_2way(fmt, ik->x[!is_back] - 1, b1, b2, tk);
 	//fmt_e2_occ_2way(fmt, ik->x[!is_back] - 1 + ik->x[2], b1, b2, tl);
 	// 这里是反向扩展
@@ -655,9 +547,9 @@ uint32_t str2bit(string &str)
 int main_fmtidx(int argc, char **argv)
 {
 	// string seq("ACCCTAACCCTAACCCTAACCCTAACCCTAACCCTAACCCTAACCCTAACCCTAACCCTA");
-	string seq("ACCCT");
-	string rseq = calc_reverse_seq(seq);
-	seq = seq + rseq;
+	//string seq("ACCCT");
+	//string rseq = calc_reverse_seq(seq);
+	//seq = seq + rseq;
 	//create_bwt_mtx(seq);
 	//cout << seq << endl;
 
@@ -682,92 +574,93 @@ int main_fmtidx(int argc, char **argv)
 	// }
 
 	// return 0;
+	string prefix = argv[1];
+	string bwt_str = prefix + ".bwt.str";
+	string bwt_idx, fmt_idx;
+	bwt_t *bwt;
+	FMTIndex *fmt;
+	ostringstream oss_bwt, oss_fmt;
+	oss_bwt << '.' << OCC_INTERVAL;
+	oss_fmt << '.' << FMT_OCC_INTERVAL;
+#ifdef FMT_MID_INTERVAL
+	oss_fmt << '.' << FMT_MID_INTERVAL;
+#endif
 
-	// string bwt_str = string(argv[1]) + ".bwt.str";
-	string bwt_idx = string(argv[1]) + ".128.bwt";
-	// string bwt_idx = string(argv[1]) + ".64.bwt";
-	// string bwt_idx = string(argv[1]) + ".16.bwt";
-	// string bwt_idx = string(argv[1]) + ".bwt";
-	//bwt_t *bwt = restore_bwt(bwt_str.c_str());
-	//create_interval_occ_bwt(bwt);
-	//dump_bwt(bwt_idx.c_str(), bwt);
+	bwt_idx = prefix + oss_bwt.str() + ".bwt";
+	fmt_idx = prefix + oss_fmt.str() + ".fmt";
 
-	//string fmt_idx = string(argv[1]) + ".fmt";
-	//string fmt_idx = string(argv[1]) + ".256.8.fmt";
-	string fmt_idx = string(argv[1]) + ".256.fmt";
-	//string fmt_idx = string(argv[1]) + ".128.fmt";
-	// string fmt_idx = string(argv[1]) + ".64.fmt";
-	// string fmt_idx = string(argv[1]) + ".32.fmt";
+	cout << bwt_idx << endl;
+	cout << fmt_idx << endl;
 
-	t11 = realtime();
-	bwt_t *bwt = restore_bwt(bwt_idx.c_str());
-	t11 = realtime() - t11;
-	cout << "[time read bwt:] " << t11 << "s" << endl;
-	t10 = realtime();
-	FMTIndex *fmt = restore_fmt(fmt_idx.c_str());
-	//FMTIndex *fmt = create_fmt_from_bwt(bwt);
-	//dump_fmt(fmt_idx.c_str(), fmt);
-	t10 = realtime() - t10;
-	cout << "[time gen fmt:] " << t10 << "s" << endl;
+// 生成或读取bwt索引文件
+	double time_read_bwt = realtime();
+#if 0
+	bwt = restore_bwt(bwt_str.c_str());
+	create_interval_occ_bwt(bwt);
+	dump_bwt(bwt_idx.c_str(), bwt);
+#else
+	bwt = restore_bwt(bwt_idx.c_str());
+#endif
+	time_read_bwt = realtime() - time_read_bwt;
+	cout << "[time gen/read bwt:] " << time_read_bwt << "s" << endl;
 
-	vector<string> seed_arr(10000000);
-	seed_arr[0] = "GCGATACTAAGA";
-	seed_arr[0] = "GAGAGCTGTTCCCGTGTTTTCCATGGTTT";
+// 生成或读取fmt索引文件
+	double time_read_fmt = realtime();
+#if 0
+	fmt = create_fmt_from_bwt(bwt);
+	dump_fmt(fmt_idx.c_str(), fmt);
+#else
+	fmt = restore_fmt(fmt_idx.c_str());
+#endif
+	time_read_fmt = realtime() - time_read_fmt;
+	cout << "[time gen/read fmt:] " << time_read_fmt << "s" << endl;
+
+// 生成随机序列进行测试
+	int seq_size = 10000000;
+	// int seq_size = 1;
+	int seq_len = 19;
+	vector<string> seq_arr(seq_size);
+	seq_arr[0] = "GCGATACTAAGA";
+	// seq_arr[0] = "GAGAGCTGTTCCCGTGTTTTCCATGGTTT";
+#if 1
 	srand(time(NULL));
+	double time_gen_seq = realtime();
+	for (int i = 0; i < (int)seq_arr.size(); ++i)
+		seq_arr[i] = generate_rand_seq(seq_len);
+	time_gen_seq = realtime() - time_gen_seq;
+	cout << "[time gen seq:] " << time_gen_seq << "s" << endl;
+#endif
 
-	t1 = realtime();
-	for (int i = 0; i < (int)seed_arr.size(); ++i)
-		seed_arr[i] = generate_rand_seq(29);
-	t1 = realtime() - t1;
-	cout << "[time gen seed:] " << t1 << "s" << endl;
+// 对比bwt和fmt搜索的时间
+#if 1
+	double time_bwt_search = realtime();
+	for (int i = 0; i < (int)seq_arr.size(); ++i)
+		bwt_search(bwt, seq_arr[i]);
+	time_bwt_search = realtime() - time_bwt_search;
+	cout << "[time bwt search:] " << time_bwt_search << "s" << endl;
 
-	t2 = realtime();
-	for (int i = 0; i < (int)seed_arr.size(); ++i)
-		bwt_search(bwt, seed_arr[i]);
-	t2 = realtime() - t2;
-	cout << "[time bwt search:] " << t2 << "s" << endl;
-	t3 = realtime();
-	for (int i = 0; i < (int)seed_arr.size(); ++i)
-		fmt_search(fmt, seed_arr[i]);
-	t3 = realtime() - t3;
-	cout << "[time fmt search:] " << t3 << "s" << endl;
+	double time_fmt_search = realtime();
+	for (int i = 0; i < (int)seq_arr.size(); ++i)
+		fmt_search(fmt, seq_arr[i]);
+	time_fmt_search = realtime() - time_fmt_search;
+	cout << "[time fmt search:] " << time_fmt_search << "s" << endl;
+#endif
 
-	//return 0;
-
-	t4 = realtime();
-	for (int i = 0; i < (int)seed_arr.size(); ++i)
+// 对比bwt和fmt搜索的结果
+#if 1
+	double time_cmp = realtime();
+	for (int i = 0; i < (int)seq_arr.size(); ++i)
 	{
-		bwtintv_t p1 =
-		bwt_search2(bwt, seed_arr[i]);
-		bwtintv_t p2 = fmt_search(fmt, seed_arr[i]);
+		bwtintv_t p1 = bwt_search2(bwt, seq_arr[i]);
+		bwtintv_t p2 = fmt_search(fmt, seq_arr[i]);
 		if (p1.x[0] != p2.x[0] || p1.x[1] != p2.x[1] || p1.x[2] != p2.x[2])
-			cout << seed_arr[i] << endl
+			cout << seq_arr[i] << endl
 				 << p1.x[0] << ' ' << p1.x[1] << ' ' << p1.x[2] << endl
-		 		 << p2.x[0] << ' ' << p2.x[1] << ' ' << p2.x[2] << endl;
+				 << p2.x[0] << ' ' << p2.x[1] << ' ' << p2.x[2] << endl;
 	}
-	t4 = realtime() - t4;
-	cout << "[time bwt search 2:] " << t4 << "s" << endl;
+	time_cmp = realtime() - time_cmp;
+	cout << "[time compare bwt & fmt:] " << time_cmp << "s" << endl;
+#endif
 
-	//cout << "bwt occ: " << t5 << "s; " << t7 << '\t' << t10 << endl;
-	//cout << "fmt occ: " << t6 << "s; " << t11 << '\t' << t8 << '\t' << t9 << endl;
-	// bwt_search(bwt, s);
-	// bwt_search2(bwt, s);
-	// for (int i = 0; i < 120; ++i)
-	// {
-	// 	cout << i << '\t' << bwt_B0(bwt, i) << endl;
-	// }
-	// TGGGAT
-	// FMTIndex *fmt = create_fmt_from_bwt(bwt);
-	// dump_fmt("ref.fmt", fmt);
-	// FMTIndex *fmt = restore_fmt("tiny.fmt");
-
-	//fmt_search(fmt, s);
-	// cout << bwt->bwt_size << endl;
-	// cout << bwt->seq_len << endl;
-	//cout << "sec_: " << fmt->sec_bcp << '\t' << fmt->sec_primary << endl;
-
-	//uint8_t b8 = 2 << 4 | 2;
-	//cout << "AGAG: " << fmt->cnt_table[2][b8] << endl;
-	//cout << (((b8 >> 6) == 0 && (b8 >> 4 & 3) == 2) + ((b8 >> 2 & 3) == 0 && (b8 & 3) == 2)) << endl;
 	return 0;
 }
\ No newline at end of file
diff --git a/fmt_index.h b/fmt_index.h
index d4d58ca..aca2472 100644
--- a/fmt_index.h
+++ b/fmt_index.h
@@ -5,18 +5,26 @@
 #define FMT_OCC_INTERVAL (1LL << FMT_OCC_INTV_SHIFT)
 #define FMT_OCC_INTV_MASK (FMT_OCC_INTERVAL - 1)
 
-#define FMT_MID_INTV_SHIFT 4
+#define FMT_MID_INTV_SHIFT 7
 #define FMT_MID_INTERVAL (1LL << FMT_MID_INTV_SHIFT)
 #define FMT_MID_INTV_MASK (FMT_MID_INTERVAL - 1)
 
+// #undef FMT_MID_INTERVAL
+
 // 获取碱基c（待查找序列的首个碱基）和对应的互补碱基对应的行，以及间隔
 #define fmt_set_intv(fmt, c, ik) ((ik).x[0] = (fmt)->L2[(int)(c)] + 1, (ik).x[2] = (fmt)->L2[(int)(c) + 1] - (fmt)->L2[(int)(c)], (ik).x[1] = (fmt)->L2[3 - (c)] + 1, (ik).info = 0)
 // k行（bwt str行（不包含$））对应的check point occ数据起始地址（小于k且是OCC_INTERVAL的整数倍）
-#if FMT_MID_INTERVAL == 16
-// 包含mid interval
-#define fmt_occ_intv(b, k) ((b)->bwt + (k) / FMT_OCC_INTERVAL * (FMT_OCC_INTERVAL / 8 + 80))
-#elif FMT_MID_INTERVAL == 8
+
+#if FMT_MID_INTERVAL == 8
 #define fmt_occ_intv(b, k) ((b)->bwt + (k) / FMT_OCC_INTERVAL * (FMT_OCC_INTERVAL / 8 + 144))
+#elif FMT_MID_INTERVAL == 16
+#define fmt_occ_intv(b, k) ((b)->bwt + (k) / FMT_OCC_INTERVAL * (FMT_OCC_INTERVAL / 8 + 80))
+#elif FMT_MID_INTERVAL == 32
+#define fmt_occ_intv(b, k) ((b)->bwt + (k) / FMT_OCC_INTERVAL * (FMT_OCC_INTERVAL / 8 + 48))
+#elif FMT_MID_INTERVAL == 64
+#define fmt_occ_intv(b, k) ((b)->bwt + (k) / FMT_OCC_INTERVAL * (FMT_OCC_INTERVAL / 8 + 32))
+#elif FMT_MID_INTERVAL == 128
+#define fmt_occ_intv(b, k) ((b)->bwt + (k) / FMT_OCC_INTERVAL * (FMT_OCC_INTERVAL / 8 + 24))
 #else
 #define fmt_occ_intv(b, k) ((b)->bwt + (k) / FMT_OCC_INTERVAL * (FMT_OCC_INTERVAL / 8 + 20))
 #endif