diff --git a/src/bqsr/bqsr_entry.cpp b/src/bqsr/bqsr_entry.cpp
index 5e627cf..e965ffc 100644
--- a/src/bqsr/bqsr_entry.cpp
+++ b/src/bqsr/bqsr_entry.cpp
@@ -252,17 +252,15 @@ int SerialBQSR(AuxVar &aux) {
                 skips[ii] = skips[ii] || (ContextCovariate::baseIndexMap[sd.bases[ii]] == -1) ||
                             sd.base_quals[ii] < nsgv::gBqsrArg.PRESERVE_QSCORES_LESS_THAN;
             }
+            //stringstream ss;
+            //for (auto s : skips) ss << (int)s << ' ';
+            //spdlog::info("{}", ss.str());
             PROF_GP_END(read_vcf);
-#if 0
-            int fidx = 0;
-            if (sd.rid % 2 == 0)
-                fidx = 0;
-            else
-                fidx = 1;
-            fprintf(gf[fidx], "%ld %d\t", sd.rid, sd.read_len);
-            for (int ii = 0; ii < sd.read_len; ++ii) fprintf(gf[fidx], "%d ", skips[ii] ? 1 : 0);
-            fprintf(gf[fidx], "\n");
-#endif
+
+            // fprintf(gf[4], "%s %d %ld ", bam_get_qname(sd.bw->b), sd.bw->b->core.flag, sd.rid);
+            // for (int ii = 0; ii < sd.read_len; ++ii) fprintf(gf[4], "%d ", skips[ii] ? 1 : 0);
+            // fprintf(gf[4], "\n");
+
             // fprintf(gf[0], "%ld %d\t", sd.rid, sd.read_len);
             // for (int ii = 0; ii < sd.read_len; ++ii) fprintf(gf[0], "%d ", skips[ii] ? 1 : 0);
             // fprintf(gf[0], "\n");
@@ -306,7 +304,8 @@ int SerialBQSR(AuxVar &aux) {
 }
 
 // 多线程处理bam数据, tmd是乱序的？
-static void thread_worker(void* data, long idx, int tid, int steal) {
+// static void thread_worker(void* data, long idx, int tid, int steal) {
+static void thread_worker(void* data, long idx, int tid) {
     AuxVar& aux = (*(vector<AuxVar>*)data)[tid];
     auto& readCovariates = aux.readCovariates;
     RecalTables& recalTables = aux.recalTables;
@@ -316,8 +315,7 @@ static void thread_worker(void* data, long idx, int tid, int steal) {
     StableArray<double>&snpErrors = aux.snpErrors, &insErrors = aux.insErrors, &delErrors = aux.delErrors;
     StableArray<uint8_t>& skips = aux.skips;  // 该位置是否是已知位点
     auto &bams = *aux.bamArr;
-    if (steal)
-        for (auto& vcf : aux.vcfArr) vcf.knownSites.clear();
+    // if (steal) for (auto& vcf : aux.vcfArr) vcf.knownSites.clear();
 #if 1
     int startIdx = idx * aux.BAM_BLOCK_NUM;
     int stopIdx = std::min((size_t)(idx + 1) * aux.BAM_BLOCK_NUM, bams.size());
@@ -407,7 +405,7 @@ int ParallelBQSR(vector<AuxVar>& auxArr) {
         spdlog::info("{} reads processed in {} round", readNum, round);
 
 #if 1
-        kt_for_steal(auxArr.size(), thread_worker, &auxArr, (readNum + AuxVar::BAM_BLOCK_NUM - 1) / AuxVar::BAM_BLOCK_NUM);
+        kt_for_no_steal(auxArr.size(), thread_worker, &auxArr, (readNum + AuxVar::BAM_BLOCK_NUM - 1) / AuxVar::BAM_BLOCK_NUM);
 #else
         kt_for_steal(auxArr.size(), thread_worker, &auxArr, auxArr.size());
 #endif
diff --git a/src/util/bam_buf.cpp b/src/util/bam_buf.cpp
index 54a9149..07c5877 100644
--- a/src/util/bam_buf.cpp
+++ b/src/util/bam_buf.cpp
@@ -18,8 +18,7 @@ int BamBuf::ReadBam() {
     if (handle_last) {             // 处理上次读入的最后一个bam
         if (has_enough_space()) {  // 必须调用，在边界处调整memffset
             if (filter_out == nullptr || !filter_out(bw->b)) {  // 这里也要加过滤器
-                ++read_num;
-                append_one_bam();
+                read_num += append_one_bam();
             }
         } else {
             return read_num;  // 还是没空间
@@ -28,11 +27,9 @@ int BamBuf::ReadBam() {
     while (read_stat_ >= 0 && (read_stat_ = sam_read1(fp, hdr, bw->b)) >= 0) {
         bw->end_pos_ = BamWrap::BamEndPos(bw->b);
         if (has_enough_space()) {  // 还有空间
-                                   // if (true) {  // 还有空间
             // 加过滤器
             if (filter_out == nullptr || !filter_out(bw->b)) {
-                append_one_bam();
-                ++read_num;  // 放进缓存才算读取到
+                read_num += append_one_bam();  // 放进缓存才算读取到
             }
         } else {
             break;
@@ -110,8 +107,10 @@ inline bool BamBuf::has_enough_space() {
 }
 
 // 处理一个读取后的bam
-inline void BamBuf::append_one_bam() {
-    BamWrap *bwp = (BamWrap *)(mem + mem_offset);
+inline int BamBuf::append_one_bam() {
+    if (filter_out != nullptr && filter_out(bw->b))
+        return 0;
+    BamWrap* bwp = (BamWrap*)(mem + mem_offset);
     *bwp = *bw;
     bwp->b = (bam1_t *)((char *)bwp + sizeof(*bwp));
     bam1_t *bp = bwp->b;
@@ -121,6 +120,7 @@ inline void BamBuf::append_one_bam() {
     // 更新下次存储的位置
     mem_offset = (mem_offset + bw->length() + 8 - 1) & ~((size_t)(8 - 1));
     bv.push_back(bwp);
+    return 1;
 }
 
 // 处理上次读入的最后一个read
diff --git a/src/util/bam_buf.h b/src/util/bam_buf.h
index dfb3405..750a2f3 100644
--- a/src/util/bam_buf.h
+++ b/src/util/bam_buf.h
@@ -85,7 +85,7 @@ struct BamBuf {
     // 检查缓存是否还有空间
     bool has_enough_space();
     // 处理一个读取后的bam
-    void append_one_bam();
+    int append_one_bam();
     // 处理上次读入的最后一个read
     bool handle_last_read();