diff --git a/src/gausskernel/process/threadpool/knl_session.cpp b/src/gausskernel/process/threadpool/knl_session.cpp
index da08250ed..4b1d651a9 100755
--- a/src/gausskernel/process/threadpool/knl_session.cpp
+++ b/src/gausskernel/process/threadpool/knl_session.cpp
@@ -1482,6 +1482,13 @@ static void knl_u_datavec_init(knl_u_datavec_context* datavec_cxt)
     datavec_cxt->ivfflat_probes = 0;
 }
 
+#ifdef ENABLE_HTAP
+static void knl_u_imcstore_init(knl_u_imcstore_context* imcstore_context)
+{
+    imcstore_context->pinnedRowGroups = NIL;
+}
+#endif
+
 void knl_session_init(knl_session_context* sess_cxt)
 {
     Assert (0 != strncmp(CurrentMemoryContext->name, "ErrorContext", sizeof("ErrorContext")));
@@ -1584,6 +1591,10 @@ void knl_session_init(knl_session_context* sess_cxt)
 
     knl_u_opfusion_reuse_init(&sess_cxt->opfusion_reuse_ctx);
 
+#ifdef ENABLE_HTAP
+    knl_u_imcstore_init(&sess_cxt->imcstore_ctx);
+#endif
+
     MemoryContextSeal(sess_cxt->top_mem_cxt);
 }
 
diff --git a/src/gausskernel/storage/cstore/cstore_am.cpp b/src/gausskernel/storage/cstore/cstore_am.cpp
index 5c814f1c9..5a8f44953 100644
--- a/src/gausskernel/storage/cstore/cstore_am.cpp
+++ b/src/gausskernel/storage/cstore/cstore_am.cpp
@@ -70,6 +70,7 @@
 #include "executor/executor.h"
 #ifdef ENABLE_HTAP
 #include "access/htap/imcucache_mgr.h"
+#include "access/htap/imcstore_am.h"
 #endif
 
 #ifdef PGXC
@@ -718,6 +719,9 @@ void CStoreAbortCU()
 #endif
         CUListPrefetchAbort();
     }
+#ifdef ENABLE_HTAP
+    UnlockRowGroups();
+#endif
 }
 
 /*
diff --git a/src/gausskernel/storage/htap/imcstore_am.cpp b/src/gausskernel/storage/htap/imcstore_am.cpp
index 34a32d8f5..481c773df 100644
--- a/src/gausskernel/storage/htap/imcstore_am.cpp
+++ b/src/gausskernel/storage/htap/imcstore_am.cpp
@@ -108,7 +108,8 @@ void IMCStore::InitScan(CStoreScanState* state, Snapshot snapshot)
     m_relation = state->ss_currentRelation;
 
     m_imcstoreDesc = IMCU_CACHE->GetImcsDesc(RelationGetRelid(m_relation));
-    m_currentRowGroups = NIL;
+    UnlockRowGroups();
+    u_sess->imcstore_ctx.pinnedRowGroups = NIL;
     m_ctidCol = m_imcstoreDesc->imcsNatts;
     m_deltaScanCurr = 0;
     m_deltaMaskMax = 0;
@@ -420,7 +421,8 @@ bool IMCStore::LoadCUDesc(
         if (rowgroup != NULL) {
             pthread_rwlock_rdlock(&rowgroup->m_mutex);
             MemoryContext old = MemoryContextSwitchTo(m_scanMemContext);
-            m_currentRowGroups = lappend(m_currentRowGroups, rowgroup);
+            PinnedRowGroup* pinned = New(CurrentMemoryContext)PinnedRowGroup(rowgroup, m_imcstoreDesc);
+            u_sess->imcstore_ctx.pinnedRowGroups = lappend(u_sess->imcstore_ctx.pinnedRowGroups, pinned);
             MemoryContextSwitchTo(old);
         }
         char* valPtr = NULL;
@@ -532,14 +534,11 @@ void IMCStore::GetCUDeleteMaskIfNeed(_in_ uint32 cuid, _in_ Snapshot snapShot)
     DeltaOperationType ctidtpye;
 
     while ((item = deltaIter.GetNext(&ctidtpye, nullptr)) != NULL) {
-        if (ctidtpye == DeltaOperationType::IMCSTORE_INSERT) {
-            BlockNumber blockoffset = ItemPointerGetBlockNumber(item) - cuid * MAX_IMCS_PAGES_ONE_CU;
-            OffsetNumber offset = ItemPointerGetOffsetNumber(item);
-            uint64 idx = blockoffset * MAX_POSSIBLE_ROW_PER_PAGE + offset;
-            m_cuDeltaMask[idx >> 3] |= (1 << (idx % 8));
-            m_deltaMaskMax = Max(idx, m_deltaMaskMax);
-            continue;
-        }
+        BlockNumber blockoffset = ItemPointerGetBlockNumber(item) - cuid * MAX_IMCS_PAGES_ONE_CU;
+        OffsetNumber offset = ItemPointerGetOffsetNumber(item);
+        uint64 idx = blockoffset * MAX_POSSIBLE_ROW_PER_PAGE + offset;
+        m_cuDeltaMask[idx >> 3] |= (1 << (idx % 8));
+        m_deltaMaskMax = Max(idx, m_deltaMaskMax);
         if (cu == NULL) {
             continue;
         }
@@ -785,14 +784,17 @@ RETRY_LOAD_CU:
     return cuPtr;
 }
 
-void IMCStore::UnlockRowGroups()
+void UnlockRowGroups()
 {
-    if (!m_currentRowGroups) return;
-    ListCell *lc = NULL;
-    foreach(lc, m_currentRowGroups) {
-        RowGroup* rowgroup = (RowGroup*)lfirst(lc);
-        pthread_rwlock_unlock(&rowgroup->m_mutex);
-        m_imcstoreDesc->UnReferenceRowGroup();
+    if (!u_sess->imcstore_ctx.pinnedRowGroups) {
+        return;
     }
-    list_free_ext(m_currentRowGroups);
+    ListCell *lc = NULL;
+    foreach(lc, u_sess->imcstore_ctx.pinnedRowGroups) {
+        PinnedRowGroup* pinned = (PinnedRowGroup*)lfirst(lc);
+        pthread_rwlock_unlock(&pinned->rowgroup->m_mutex);
+        pinned->desc->UnReferenceRowGroup();
+        delete pinned;
+    }
+    list_free_ext(u_sess->imcstore_ctx.pinnedRowGroups);
 }
diff --git a/src/include/access/htap/imcstore_am.h b/src/include/access/htap/imcstore_am.h
index fd1e40e57..b1eb99baa 100644
--- a/src/include/access/htap/imcstore_am.h
+++ b/src/include/access/htap/imcstore_am.h
@@ -76,7 +76,6 @@ public:
     void FillPerRowGroupDelta(_in_ IMCStoreScanState* state, _in_ uint32 cuid, _out_ VectorBatch* vecBatchOut);
     bool InsertDeltaRowToBatch(_in_ IMCStoreScanState* state, ItemPointerData item, _out_ VectorBatch* vecBatchOut);
     bool ImcstoreFillByDeltaScan(_in_ CStoreScanState* state, _out_ VectorBatch* vecBatchOut) override;
-    void UnlockRowGroups();
 
 private:
     IMCUStorage** m_imcuStorage;
@@ -90,5 +89,12 @@ private:
     List* m_currentRowGroups;
 };
 
+typedef struct PinnedRowGroup : public BaseObject {
+    RowGroup *rowgroup;
+    IMCSDesc *desc;
+    PinnedRowGroup(RowGroup *rowgroup, IMCSDesc *desc) : rowgroup(rowgroup), desc(desc) {};
+} PinnedRowGroup;
+void UnlockRowGroups();
+
 #endif // ENABLE_HTAP
 #endif // IMCSTORE_AM_H
diff --git a/src/include/knl/knl_session.h b/src/include/knl/knl_session.h
index 119494015..93fd313b3 100644
--- a/src/include/knl/knl_session.h
+++ b/src/include/knl/knl_session.h
@@ -3014,6 +3014,12 @@ typedef struct knl_u_datavec_context {
     int ivfflat_probes;
 } knl_u_datavec_context;
 
+#ifdef ENABLE_HTAP
+typedef struct knl_u_imcstore_context {
+    List* pinnedRowGroups;
+} knl_u_imcstore_context;
+#endif
+
 typedef struct knl_session_context {
     volatile knl_session_status status;
     /* used for threadworker, elem in m_readySessionList */
@@ -3170,6 +3176,10 @@ typedef struct knl_session_context {
 
     knl_u_datavec_context datavec_ctx;
 
+#ifdef ENABLE_HTAP
+    knl_u_imcstore_context imcstore_ctx;
+#endif
+
 } knl_session_context;
 
 enum stp_xact_err_type {