diff --git a/src/storage/compaction/ob_partition_merge_progress.cpp b/src/storage/compaction/ob_partition_merge_progress.cpp
index 6d5d97613f5fed2771f7db1a2ac1f8035c1ab372..0aa4511bf21c48f4b3b2619d3ba63807da6eb9bd 100644
--- a/src/storage/compaction/ob_partition_merge_progress.cpp
+++ b/src/storage/compaction/ob_partition_merge_progress.cpp
@@ -134,7 +134,6 @@ int ObPartitionMergeProgress::estimate(ObTabletMergeCtx *ctx)
     LOG_WARN("get invalid arguments", K(ret), K(ctx));
   } else {
     const ObIArray<ObITable*> &tables = ctx->tables_handle_.get_tables();
-    ObITable *table = nullptr;
     int64_t old_major_data_size = 0;
     if (OB_UNLIKELY(0 == tables.count() || NULL == tables.at(0))) {
       ret = OB_ERR_UNEXPECTED;
@@ -162,26 +161,30 @@ int ObPartitionMergeProgress::estimate(ObTabletMergeCtx *ctx)
         } else {
           estimate_row_cnt_ = MAX(1, part_estimate.physical_row_count_);
           for (int64_t i = tables.count() - 1; i >= 0; --i) {
-            if (OB_ISNULL(table = tables.at(i))) {
+            if (OB_UNLIKELY(nullptr == tables.at(i) || !tables.at(i)->is_memtable())) {
               ret = OB_ERR_UNEXPECTED;
-              LOG_WARN("get unexpected null table", K(ret), K(i), K(table));
-            } else if (table->is_memtable()) {
-              estimate_occupy_size_ = static_cast<ObMemtable *>(table)->get_occupied_size();
+              LOG_WARN("get unexpected null table", K(ret), K(i), K(tables.at(i)));
+            } else {
+              estimate_occupy_size_ += static_cast<ObMemtable *>(tables.at(i))->get_occupied_size();
             }
           }
         }
       }
     } else {
+      int64_t total_macro_block_cnt = 0;
+      ObSSTable *table = nullptr;
       for (int64_t i = 0; OB_SUCC(ret) && i < tables.count(); ++i) {
-        if (OB_ISNULL(table = tables.at(i))) {
+        if (OB_UNLIKELY(nullptr == tables.at(i) || !tables.at(i)->is_sstable())) {
           ret = OB_ERR_UNEXPECTED;
-          LOG_WARN("get unexpected null table", K(ret), K(i), K(table));
-        } else if (table->is_sstable()) {
-          const ObSSTableBasicMeta &meta = static_cast<ObSSTable *>(table)->get_meta().get_basic_meta();
+          LOG_WARN("get unexpected table", K(ret), K(i), KPC(tables.at(i)));
+        } else {
+          table = static_cast<ObSSTable *>(tables.at(i));
+          const ObSSTableBasicMeta &meta = table->get_meta().get_basic_meta();
           if (meta.get_total_macro_block_count() <= 0) {
             LOG_DEBUG("table is empty, skip it", K(i), KPC(static_cast<ObSSTable *>(table)));
             continue;
           } else {
+            total_macro_block_cnt += meta.get_total_macro_block_count() - meta.get_total_use_old_macro_block_count();
             estimate_row_cnt_ += meta.row_count_;
             estimate_occupy_size_ += meta.occupy_size_;
             if (table->is_major_sstable()) {
@@ -190,6 +193,10 @@ int ObPartitionMergeProgress::estimate(ObTabletMergeCtx *ctx)
           }
         }
       }
+      if (0 != total_macro_block_cnt) {
+        estimate_row_cnt_ = (0 == estimate_row_cnt_) ? DEFAULT_ROW_CNT_PER_MACRO_BLOCK * total_macro_block_cnt : estimate_row_cnt_;
+        estimate_occupy_size_ = (0 == estimate_occupy_size_) ? common::OB_DEFAULT_MACRO_BLOCK_SIZE * total_macro_block_cnt : estimate_occupy_size_;
+      }
     }
 
     if (OB_SUCC(ret)) {
@@ -241,9 +248,6 @@ int ObPartitionMergeProgress::update_merge_progress(
   if (IS_NOT_INIT) {
     ret = OB_NOT_INIT;
     LOG_WARN("ObPartitionMergeProgress not inited", K(ret));
-  } else if (OB_UNLIKELY(0 == estimate_row_cnt_)) {
-    ret = OB_ERR_UNEXPECTED;
-    LOG_WARN("unexpected zero estimate_total_units_", K(ret));
   } else if (OB_UNLIKELY(idx < 0 || idx >= concurrent_cnt_ || scanned_row_cnt < 0 || output_block_cnt < 0)) {
     ret = OB_INVALID_ARGUMENT;
     LOG_WARN("get invalid arguments", K(ret), K(idx), K(concurrent_cnt_), K(scanned_row_cnt), K(output_block_cnt));
@@ -264,7 +268,7 @@ int ObPartitionMergeProgress::update_merge_progress(
         }
 
         if (scanned_row_cnt >= estimate_row_cnt_) {
-          estimate_row_cnt_ += scanned_row_cnt - pre_scanned_row_cnt_;
+          estimate_row_cnt_ += MAX(scanned_row_cnt / DEFAULT_INCREMENT_ROW_FACTOR, 1);
           avg_row_length_ = estimate_occupy_size_ * 1.0 / estimate_row_cnt_;
         }
 
@@ -295,14 +299,14 @@ int ObPartitionMergeProgress::update_merge_info(ObSSTableMergeInfo &merge_info)
 void ObPartitionMergeProgress::update_estimated_finish_time_()
 {
   int64_t current_time = ObTimeUtility::fast_current_time();
-  if (0 == pre_scanned_row_cnt_) {
+  if (0 == pre_scanned_row_cnt_) { // first time to init merge_progress
     int64_t spend_time = estimate_occupy_size_ / common::OB_DEFAULT_MACRO_BLOCK_SIZE * ObCompactionProgress::MERGE_SPEED
         + ObCompactionProgress::EXTRA_TIME;
     estimated_finish_time_ = spend_time + current_time + UPDATE_INTERVAL;
   } else {
-    int64_t rest_time = (estimate_row_cnt_ - pre_scanned_row_cnt_)
-        * (current_time - merge_dag_->get_start_time()) / pre_scanned_row_cnt_;
-    estimated_finish_time_ = current_time + rest_time + UPDATE_INTERVAL;
+    int64_t delta_row_cnt = estimate_row_cnt_ - pre_scanned_row_cnt_;
+    int64_t rest_time = MAX(1, delta_row_cnt) * (current_time - merge_dag_->get_start_time()) / pre_scanned_row_cnt_;
+    estimated_finish_time_ = MAX(estimated_finish_time_, current_time + rest_time + UPDATE_INTERVAL);
   }
 }
 
@@ -378,7 +382,7 @@ int ObPartitionMajorMergeProgress::update_merge_progress(
         }
 
         if (scanned_row_cnt >= estimate_row_cnt_) {
-          estimate_row_cnt_ += scanned_row_cnt - pre_scanned_row_cnt_;
+          estimate_row_cnt_ += MAX(scanned_row_cnt / DEFAULT_INCREMENT_ROW_FACTOR, 1);
           avg_row_length_ = estimate_occupy_size_ * 1.0 / estimate_row_cnt_;
         }
 
diff --git a/src/storage/compaction/ob_partition_merge_progress.h b/src/storage/compaction/ob_partition_merge_progress.h
index 995226661c99f651bc0e831d7881879ca34ecdb6..0624f4f77f7535e5fd048cca5089c086767f63be 100644
--- a/src/storage/compaction/ob_partition_merge_progress.h
+++ b/src/storage/compaction/ob_partition_merge_progress.h
@@ -50,6 +50,8 @@ public:
 public:
   static const int32_t UPDATE_INTERVAL = 2 * 1000 * 1000; // 2 second
   static const int32_t NORMAL_UPDATE_PARAM = 300;
+  static const int32_t DEFAULT_ROW_CNT_PER_MACRO_BLOCK = 1000;
+  static const int32_t DEFAULT_INCREMENT_ROW_FACTOR = 10;
 protected:
   int estimate(ObTabletMergeCtx *ctx);
   void update_estimated_finish_time_();