diff --git a/src/observer/ob_signal_handle.cpp b/src/observer/ob_signal_handle.cpp
index 81f0fddb5..133c46bd8 100644
--- a/src/observer/ob_signal_handle.cpp
+++ b/src/observer/ob_signal_handle.cpp
@@ -243,13 +243,6 @@ int ObSignalHandle::deal_signals(int signum)
       ObTenantMemoryPrinter::get_instance().print_tenant_usage();
       break;
     }
-    case 64: {
-      // Print memtable stat. By yijun.fyj.
-      if (OB_FAIL(memtable::ObMemtableStat::get_instance().print_stat())) {
-        LOG_WARN("Print memtable stat error", K(ret));
-      }
-      break;
-    }
     default: {
       LOG_WARN("Ignore unknown signal", K(signum));
       break;
diff --git a/src/storage/memtable/ob_memtable.cpp b/src/storage/memtable/ob_memtable.cpp
index d2d955ff1..4a3e1a791 100644
--- a/src/storage/memtable/ob_memtable.cpp
+++ b/src/storage/memtable/ob_memtable.cpp
@@ -181,7 +181,6 @@ int ObMemtable::init(const ObITable::TableKey &table_key,
     TRANS_LOG(WARN, "failed to set_table_key", K(ret), K(table_key));
   } else {
     ls_handle_ = ls_handle;
-    ObMemtableStat::get_instance().register_memtable(this);
     if (table_key.get_tablet_id().is_sys_tablet()) {
       mode_ = lib::Worker::CompatMode::MYSQL;
     } else {
@@ -232,8 +231,6 @@ void ObMemtable::destroy()
     }
     STORAGE_LOG(INFO, "memtable destroyed", K(*this));
     time_guard.click();
-    ObMemtableStat::get_instance().unregister_memtable(this);
-    time_guard.click();
     ObTenantFreezer *freezer = nullptr;
     freezer = MTL(ObTenantFreezer *);
     if (OB_SUCCESS != freezer->unset_tenant_slow_freeze(tablet_id)) {
@@ -2416,77 +2413,6 @@ bool ObMemtable::has_multi_source_data_unit(const MultiSourceDataUnitType type)
 }
 
 
-ObMemtableStat::ObMemtableStat()
-    : lock_(common::ObLatchIds::MEMTABLE_STAT_LOCK),
-      memtables_()
-{
-  memtables_.set_attr(SET_USE_500("MemTables"));
-}
-
-ObMemtableStat::~ObMemtableStat()
-{}
-
-ObMemtableStat &ObMemtableStat::get_instance()
-{
-  static ObMemtableStat s_instance;
-  return s_instance;
-}
-
-int ObMemtableStat::register_memtable(ObMemtable *memtable)
-{
-  int ret = OB_SUCCESS;
-  ObSpinLockGuard guard(lock_);
-  if (OB_ISNULL(memtable)) {
-    ret = OB_INVALID_ARGUMENT;
-    TRANS_LOG(WARN, "invalid argument", K(memtable));
-  } else if (OB_FAIL(memtables_.push_back(memtable))) {
-    TRANS_LOG(ERROR, "err push memtable ptr", K(ret));
-  }
-  return ret;
-}
-
-int ObMemtableStat::unregister_memtable(ObMemtable *memtable)
-{
-  int ret = OB_SUCCESS;
-  ObSpinLockGuard guard(lock_);
-  bool done = false;
-  if (OB_ISNULL(memtable)) {
-    ret = OB_INVALID_ARGUMENT;
-    TRANS_LOG(WARN, "invalid argument", K(memtable));
-  } else {
-    for (int64_t idx = 0, cnt = memtables_.size();
-         (OB_SUCC(ret)) && !done && (idx < cnt);
-         ++idx) {
-      if (memtable == memtables_.at(idx)) {
-        memtables_.at(idx) = memtables_.at(cnt - 1);
-        if (OB_FAIL(memtables_.remove(cnt - 1))) {
-          TRANS_LOG(WARN, "memtable remove fail", K(ret), K(idx));
-        } else {
-          done = true;
-        }
-      }
-    }
-    if (!done && OB_SUCCESS == ret) {
-      ret = OB_ENTRY_NOT_EXIST;
-    }
-  }
-  return ret;
-}
-
-int ObMemtableStat::print_stat()
-{
-  int ret = OB_SUCCESS;
-  ObSpinLockGuard guard(lock_);
-  TRANS_LOG(INFO, "[memtable stat]", "memtable_cnt", memtables_.size());
-  for (int64_t idx = 0, cnt = memtables_.size(); OB_SUCC(ret) && (idx < cnt); ++idx) {
-    if (OB_FAIL(memtables_.at(idx)->print_stat())) {
-      TRANS_LOG(ERROR, "print memtable stat fail", K(ret));
-    }
-  }
-  TRANS_LOG(INFO, "[memtable stat] end.");
-  return ret;
-}
-
 int RowHeaderGetter::get()
 {
   int ret = OB_ENTRY_NOT_EXIST;
diff --git a/src/storage/memtable/ob_memtable.h b/src/storage/memtable/ob_memtable.h
index c6ade4f64..6c33c26d3 100644
--- a/src/storage/memtable/ob_memtable.h
+++ b/src/storage/memtable/ob_memtable.h
@@ -693,29 +693,6 @@ int ObMemtable::get_multi_source_data_unit_list(
   return ret;
 }
 
-typedef ObMemtable ObMemStore;
-
-/*
- * Print memtable statistics when receiving a signal.
- * For debug use.
- */
-class ObMemtableStat
-{
-public:
-  ObMemtableStat();
-  virtual ~ObMemtableStat();
-  static ObMemtableStat &get_instance();
-public:
-  int register_memtable(ObMemtable *memtable);
-  int unregister_memtable(ObMemtable *memtable);
-public:
-  int print_stat();
-private:
-  DISALLOW_COPY_AND_ASSIGN(ObMemtableStat);
-  ObSpinLock lock_;
-  ObArray<ObMemtable *> memtables_;
-};
-
 class RowHeaderGetter
 {
 public: