diff --git a/sql/engines/mongo.py b/sql/engines/mongo.py
index 9ddda5802c..84581531d9 100644
--- a/sql/engines/mongo.py
+++ b/sql/engines/mongo.py
@@ -351,7 +351,7 @@ def _build_cmd(
     ):
         # 提取公共参数
         common_params = {
-            "mongo": mongo,
+            "mongo": "mongo",
             "host": self.host,
             "port": self.port,
             "db_name": db_name,
@@ -361,14 +361,14 @@ def _build_cmd(
         if is_load:
             cmd_template = (
                 "{mongo} --quiet {auth_options} {host}:{port}/{auth_db} <<\\EOF\n"
-                "db=db.getSiblingDB(\"{db_name}\");{slave_ok}load('{tempfile_}')\nEOF"
+                "db=db.getSiblingDB('{db_name}');{slave_ok}load('{tempfile_}')\nEOF"
             )
             # 长度超限使用loadjs的方式运行，使用临时文件
             common_params["tempfile_"] = tempfile_
         else:
             cmd_template = (
                 "{mongo} --quiet {auth_options} {host}:{port}/{auth_db} <<\\EOF\n"
-                'db=db.getSiblingDB("{db_name}");{slave_ok}printjson({sql})\nEOF'
+                "db=db.getSiblingDB('{db_name}');{slave_ok}printjson({sql})\nEOF"
             )
             # 长度不超限直接mongo shell，无需临时文件
             common_params["sql"] = sql
diff --git a/sql/engines/test_mongo.py b/sql/engines/test_mongo.py
new file mode 100644
index 0000000000..4046029499
--- /dev/null
+++ b/sql/engines/test_mongo.py
@@ -0,0 +1,103 @@
+import pytest
+from unittest.mock import patch, MagicMock
+from sql.engines.mongo import MongoEngine
+
+
+@pytest.fixture
+def mongo_engine():
+    engine = MongoEngine()
+    engine.host = "localhost"
+    engine.port = 27017
+    engine.user = "test_user"
+    engine.password = "test_password"
+    engine.instance = MagicMock()
+    engine.instance.db_name = "test_db"
+    return engine
+
+
+def test_build_cmd_with_load(mongo_engine):
+    # Call the method with is_load=True
+    cmd = mongo_engine._build_cmd(
+        db_name="test_db",
+        auth_db="admin",
+        slave_ok="rs.slaveOk();",
+        tempfile_="/tmp/test.js",
+        is_load=True,
+    )
+
+    # Expected command template
+    expected_cmd = (
+        "mongo --quiet -u test_user -p 'test_password' localhost:27017/admin <<\\EOF\n"
+        "db=db.getSiblingDB('test_db');rs.slaveOk();load('/tmp/test.js')\nEOF"
+    )
+
+    # Assertions
+    assert cmd == expected_cmd
+
+
+def test_build_cmd_without_load(mongo_engine):
+    # Call the method with is_load=False
+    cmd = mongo_engine._build_cmd(
+        db_name="test_db",
+        auth_db="admin",
+        slave_ok="rs.slaveOk();",
+        sql="db.test_collection.find()",
+        is_load=False,
+    )
+
+    # Expected command template
+    expected_cmd = (
+        "mongo --quiet -u test_user -p 'test_password' localhost:27017/admin <<\\EOF\n"
+        "db=db.getSiblingDB('test_db');rs.slaveOk();printjson(db.test_collection.find())\nEOF"
+    )
+
+    # Assertions
+    assert cmd == expected_cmd
+
+
+def test_build_cmd_without_auth(mongo_engine):
+    # Set user and password to None
+    mongo_engine.user = None
+    mongo_engine.password = None
+
+    # Call the method with is_load=False
+    cmd = mongo_engine._build_cmd(
+        db_name="test_db",
+        auth_db="admin",
+        slave_ok="rs.slaveOk();",
+        sql="db.test_collection.find()",
+        is_load=False,
+    )
+
+    # Expected command template
+    expected_cmd = (
+        "mongo --quiet  localhost:27017/admin <<\\EOF\n"
+        "db=db.getSiblingDB('test_db');rs.slaveOk();printjson(db.test_collection.find())\nEOF"
+    )
+
+    # Assertions
+    assert cmd == expected_cmd
+
+
+def test_build_cmd_with_load_without_auth(mongo_engine):
+    # Set user and password to None
+    mongo_engine.user = None
+    mongo_engine.password = None
+
+    # Call the method with is_load=True
+    cmd = mongo_engine._build_cmd(
+        db_name="test_db",
+        auth_db="admin",
+        slave_ok="rs.slaveOk();",
+        tempfile_="/tmp/test.js",
+        is_load=True,
+    )
+
+    # Expected command template
+    expected_cmd = (
+        "mongo --quiet  localhost:27017/admin <<\\EOF\n"
+        "db=db.getSiblingDB('test_db');rs.slaveOk();load('/tmp/test.js')\nEOF"
+    )
+
+    # Assertions
+    assert cmd == expected_cmd