diff --git a/mysql-test/suite/tianmu/r/alter_delete.result b/mysql-test/suite/tianmu/r/alter_delete.result
new file mode 100644
index 000000000..5ee275f75
--- /dev/null
+++ b/mysql-test/suite/tianmu/r/alter_delete.result
@@ -0,0 +1,28 @@
+DROP DATABASE IF EXISTS alter_delete;
+CREATE DATABASE alter_delete;
+USE alter_delete;
+CREATE TABLE ttt1(id INT,name VARCHAR(5));
+INSERT INTO ttt1 VALUES(0,"XXX"),(1,'AAA'),(2,'BBB');
+SELECT * FROM ttt1;
+id	name
+0	XXX
+1	AAA
+2	BBB
+DELETE FROM ttt1 WHERE id=1;
+SELECT * FROM ttt1;
+id	name
+0	XXX
+2	BBB
+ALTER TABLE ttt1 CONVERT TO CHARACTER SET utf8;
+SELECT * FROM ttt1;
+id	name
+0	XXX
+2	BBB
+SHOW CREATE TABLE ttt1;
+Table	Create Table
+ttt1	CREATE TABLE `ttt1` (
+  `id` int(11) DEFAULT NULL,
+  `name` varchar(5) DEFAULT NULL
+) ENGINE=TIANMU DEFAULT CHARSET=utf8
+DROP TABLE ttt1;
+DROP DATABASE alter_delete;
diff --git a/mysql-test/suite/tianmu/t/alter_delete.test b/mysql-test/suite/tianmu/t/alter_delete.test
new file mode 100644
index 000000000..3c89f4747
--- /dev/null
+++ b/mysql-test/suite/tianmu/t/alter_delete.test
@@ -0,0 +1,29 @@
+--source include/have_tianmu.inc
+
+--disable_warnings
+DROP DATABASE IF EXISTS alter_delete;
+--enable_warnings
+
+CREATE DATABASE alter_delete;
+
+USE alter_delete;
+
+CREATE TABLE ttt1(id INT,name VARCHAR(5));
+
+INSERT INTO ttt1 VALUES(0,"XXX"),(1,'AAA'),(2,'BBB');
+
+SELECT * FROM ttt1;
+
+DELETE FROM ttt1 WHERE id=1;
+
+SELECT * FROM ttt1;
+
+ALTER TABLE ttt1 CONVERT TO CHARACTER SET utf8;
+
+SELECT * FROM ttt1;
+
+SHOW CREATE TABLE ttt1;
+
+DROP TABLE ttt1;
+
+DROP DATABASE alter_delete;
diff --git a/storage/tianmu/core/dimension_group.cpp b/storage/tianmu/core/dimension_group.cpp
index 69dfc95f1..ee100b213 100644
--- a/storage/tianmu/core/dimension_group.cpp
+++ b/storage/tianmu/core/dimension_group.cpp
@@ -353,9 +353,7 @@ int DimensionGroupMaterialized::DGMaterializedIterator::GetNextPackrow(int dim,
   if (next_pack[dim] >= no_obj || uint64_t(next_pack[dim]) >= end_block)
     return -1;
   uint64_t ahead_pos = 0;
-  //	cout << "dim " << dim << ",  " << next_pack[dim] << " -> " <<
-  // ahead1[dim] << "  " <<
-  // ahead2[dim] << "  " << ahead3[dim] << "    (" << ahead << ")" << endl;
+
   if (ahead == 1)
     ahead_pos = t[dim]->Get64InsideBlock(next_pack[dim]);
   else if (ahead == 2 && ahead1[dim] != -1)
diff --git a/storage/tianmu/handler/ha_tianmu.cpp b/storage/tianmu/handler/ha_tianmu.cpp
index 118f67910..37e9857e0 100644
--- a/storage/tianmu/handler/ha_tianmu.cpp
+++ b/storage/tianmu/handler/ha_tianmu.cpp
@@ -971,10 +971,14 @@ int ha_tianmu::rnd_next(uchar *buf) {
   int ret = HA_ERR_END_OF_FILE;
   try {
     table->status = 0;
-    if (fill_row(buf) == HA_ERR_END_OF_FILE) {
+    ret = fill_row(buf);
+    if (ret == HA_ERR_END_OF_FILE) {
       table->status = STATUS_NOT_FOUND;
       DBUG_RETURN(ret);
     }
+    if (ret == HA_ERR_RECORD_DELETED) {
+      DBUG_RETURN(ret);
+    }
     ret = 0;
   } catch (std::exception &e) {
     my_message(static_cast<int>(common::ErrorCode::UNKNOWN_ERROR), e.what(), MYF(0));
@@ -1231,8 +1235,19 @@ int ha_tianmu::fill_row(uchar *buf) {
     std::memcpy(buffer.get(), table->record[0], table->s->reclength);
   }
   if (iterator_->IsBase()) {
-    for (uint col_id = 0; col_id < table->s->fields; col_id++)
-      core::Engine::ConvertToField(table->field[col_id], *(iterator_->GetBaseData(col_id)), &blob_buffers_[col_id]);
+    for (uint col_id = 0; col_id < table->s->fields; col_id++) {
+      // when ConvertToField() return true, to judge whether this line has been deleted.
+    // if this line has been deleted, data will not be copied.
+    if (core::Engine::ConvertToField(table->field[col_id], *(iterator_->GetBaseData(col_id)),
+                                     &blob_buffers_[col_id]) &&
+        (table_new_iter_.GetAttrs().size() > col_id) &&
+        table_new_iter_.GetAttrs()[col_id]->IsDelete(table_new_iter_.GetCurrentRowId())) {
+      current_position_ = table_new_iter_.GetCurrentRowId();
+      table_new_iter_++;
+      dbug_tmp_restore_column_map(table->write_set, org_bitmap);
+      return HA_ERR_RECORD_DELETED;
+    }
+  }
   } else {
     std::string delta_record = iterator_->GetDeltaData();
     core::Engine::DecodeInsertRecord(delta_record.data(), delta_record.size(), table->field);