diff --git a/internal/db/dameng_impl.go b/internal/db/dameng_impl.go
index e68fecc7..427d72fc 100644
--- a/internal/db/dameng_impl.go
+++ b/internal/db/dameng_impl.go
@@ -491,7 +491,8 @@ func (d *DamengDB) ApplyChanges(tableName string, changes connection.ChangeSet)
 }
 
 func (d *DamengDB) GetAllColumns(dbName string) ([]connection.ColumnDefinitionWithTable, error) {
-	query := fmt.Sprintf(`SELECT c.table_name, c.column_name, c.data_type, cc.comments AS comment
+	// 达梦 COMMENT 为保留字，别名使用 col_comment（Error -2007: AS comment 语法分析出错）
+	query := fmt.Sprintf(`SELECT c.table_name, c.column_name, c.data_type, cc.comments AS col_comment
 		FROM all_tab_columns c
 		LEFT JOIN all_col_comments cc
 		  ON cc.owner = c.owner AND cc.table_name = c.table_name AND cc.column_name = c.column_name
@@ -508,7 +509,7 @@ func (d *DamengDB) GetAllColumns(dbName string) ([]connection.ColumnDefinitionWi
 			TableName: fmt.Sprintf("%v", row["TABLE_NAME"]),
 			Name:      fmt.Sprintf("%v", row["COLUMN_NAME"]),
 			Type:      fmt.Sprintf("%v", row["DATA_TYPE"]),
-			Comment:   fmt.Sprintf("%v", row["COMMENT"]),
+			Comment:   getDamengRowString(row, "COL_COMMENT", "COMMENT", "COMMENTS"),
 		}
 		cols = append(cols, col)
 	}
diff --git a/internal/db/dameng_metadata.go b/internal/db/dameng_metadata.go
index 620c97f5..d26958f9 100644
--- a/internal/db/dameng_metadata.go
+++ b/internal/db/dameng_metadata.go
@@ -109,8 +109,9 @@ func buildDamengColumnsQuery(dbName, tableName string) string {
 	upperTableName := strings.ToUpper(strings.TrimSpace(tableName))
 	upperDBName := strings.ToUpper(strings.TrimSpace(dbName))
 
+	// 注意：达梦中 COMMENT 为保留字，不能使用 AS comment 作为列别名（Error -2007 语法分析出错）。
 	if upperDBName == "" {
-		return fmt.Sprintf(`SELECT c.column_name, c.data_type, c.data_length, c.char_length, c.data_precision, c.data_scale, c.nullable, c.data_default, cc.comments AS comment,
+		return fmt.Sprintf(`SELECT c.column_name, c.data_type, c.data_length, c.char_length, c.data_precision, c.data_scale, c.nullable, c.data_default, cc.comments AS col_comment,
 		CASE WHEN pk.column_name IS NOT NULL THEN 'PRI' ELSE '' END AS column_key
 		FROM user_tab_columns c
 		LEFT JOIN user_col_comments cc
@@ -127,7 +128,7 @@ func buildDamengColumnsQuery(dbName, tableName string) string {
 		ORDER BY c.column_id`, upperTableName, upperTableName, upperTableName)
 	}
 
-	return fmt.Sprintf(`SELECT c.column_name, c.data_type, c.data_length, c.char_length, c.data_precision, c.data_scale, c.nullable, c.data_default, cc.comments AS comment,
+	return fmt.Sprintf(`SELECT c.column_name, c.data_type, c.data_length, c.char_length, c.data_precision, c.data_scale, c.nullable, c.data_default, cc.comments AS col_comment,
 		CASE WHEN pk.column_name IS NOT NULL THEN 'PRI' ELSE '' END AS column_key
 		FROM all_tab_columns c
 		LEFT JOIN all_col_comments cc
@@ -247,7 +248,8 @@ func buildDamengColumnDefinitions(data []map[string]interface{}) []connection.Co
 			Type:     formatDamengColumnType(row),
 			Nullable: normalizeDamengNullable(getDamengRowString(row, "NULLABLE")),
 			Key:      getDamengRowString(row, "COLUMN_KEY"),
-			Comment:  getDamengRowString(row, "COMMENT", "COMMENTS"),
+			// col_comment：避免达梦保留字 comment 别名；兼容旧别名与原生 comments 列名
+			Comment: getDamengRowString(row, "COL_COMMENT", "COMMENT", "COMMENTS"),
 		}
 
 		defaultValue := getDamengRowString(row, "DATA_DEFAULT")
diff --git a/internal/db/dameng_metadata_test.go b/internal/db/dameng_metadata_test.go
index 52e4f534..8da4e45e 100644
--- a/internal/db/dameng_metadata_test.go
+++ b/internal/db/dameng_metadata_test.go
@@ -127,16 +127,22 @@ func TestBuildDamengColumnsQuery_IncludesColumnCommentsJoin(t *testing.T) {
 	if !strings.Contains(userQuery, "user_col_comments") {
 		t.Fatalf("expected user query to join user_col_comments, got: %s", userQuery)
 	}
-	if !strings.Contains(userQuery, "cc.comments AS comment") {
-		t.Fatalf("expected user query to select column comments, got: %s", userQuery)
+	if !strings.Contains(userQuery, "cc.comments AS col_comment") {
+		t.Fatalf("expected user query to select column comments as col_comment, got: %s", userQuery)
+	}
+	if strings.Contains(strings.ToLower(userQuery), " as comment") {
+		t.Fatalf("dameng forbids AS comment alias (reserved word), got: %s", userQuery)
 	}
 
 	allQuery := buildDamengColumnsQuery("app", "orders")
 	if !strings.Contains(allQuery, "all_col_comments") {
 		t.Fatalf("expected schema query to join all_col_comments, got: %s", allQuery)
 	}
-	if !strings.Contains(allQuery, "cc.comments AS comment") {
-		t.Fatalf("expected schema query to select column comments, got: %s", allQuery)
+	if !strings.Contains(allQuery, "cc.comments AS col_comment") {
+		t.Fatalf("expected schema query to select column comments as col_comment, got: %s", allQuery)
+	}
+	if strings.Contains(strings.ToLower(allQuery), " as comment") {
+		t.Fatalf("dameng forbids AS comment alias (reserved word), got: %s", allQuery)
 	}
 }
 
@@ -145,11 +151,11 @@ func TestBuildDamengColumnDefinitions_MapsComment(t *testing.T) {
 
 	columns := buildDamengColumnDefinitions([]map[string]interface{}{
 		{
-			"COLUMN_NAME": "ID",
-			"DATA_TYPE":   "NUMBER",
-			"NULLABLE":    "N",
-			"COLUMN_KEY":  "PRI",
-			"COMMENT":     "主键",
+			"COLUMN_NAME":  "ID",
+			"DATA_TYPE":    "NUMBER",
+			"NULLABLE":     "N",
+			"COLUMN_KEY":   "PRI",
+			"COL_COMMENT":  "主键",
 		},
 	})