diff --git a/backend/apps/datasource/crud/datasource.py b/backend/apps/datasource/crud/datasource.py
index acd7522e..0fc3e628 100644
--- a/backend/apps/datasource/crud/datasource.py
+++ b/backend/apps/datasource/crud/datasource.py
@@ -555,7 +555,8 @@ def get_table_schema(session: SessionDep, current_user: CurrentUser, ds: CoreDat
         return schema_str, []
 
     # do table embedding
-    if embedding and tables and settings.TABLE_EMBEDDING_ENABLED:
+    if (embedding and tables and settings.TABLE_EMBEDDING_ENABLED
+            and not equals_ignore_case(ds.type, "excel")):
         tables = calc_table_embedding(tables, question)
     # splice schema
     if tables:
diff --git a/tests/test_excel_table_schema.py b/tests/test_excel_table_schema.py
new file mode 100644
index 00000000..7469bb6e
--- /dev/null
+++ b/tests/test_excel_table_schema.py
@@ -0,0 +1,89 @@
+import os
+import sys
+import unittest
+from types import SimpleNamespace
+from unittest.mock import patch
+
+
+PROJECT_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+BACKEND_ROOT = os.path.join(PROJECT_ROOT, "backend")
+if BACKEND_ROOT not in sys.path:
+    sys.path.insert(0, BACKEND_ROOT)
+
+from apps.datasource.crud import datasource as datasource_crud  # noqa: E402
+
+
+def make_table_objs(count: int):
+    table_objs = []
+    for index in range(count):
+        table_name = f"sheet_{index}"
+        table = SimpleNamespace(
+            id=index + 1,
+            table_name=table_name,
+            custom_comment="",
+            embedding="[1.0, 0.0]",
+        )
+        field = SimpleNamespace(
+            field_name="amount",
+            field_type="int",
+            custom_comment="",
+        )
+        table_objs.append(SimpleNamespace(schema="public", table=table, fields=[field]))
+    return table_objs
+
+
+class TestExcelTableSchema(unittest.TestCase):
+    def test_excel_schema_keeps_all_tables_when_embedding_enabled(self):
+        table_objs = make_table_objs(12)
+        ds = SimpleNamespace(type="excel", table_relation=None)
+
+        with (
+            patch.object(datasource_crud, "get_table_obj_by_ds", return_value=table_objs),
+            patch.object(datasource_crud.settings, "TABLE_EMBEDDING_ENABLED", True),
+            patch.object(datasource_crud, "calc_table_embedding") as calc_embedding,
+        ):
+            schema, table_names = datasource_crud.get_table_schema(
+                session=None,
+                current_user=None,
+                ds=ds,
+                question="sum amount for each sheet",
+                embedding=True,
+            )
+
+        calc_embedding.assert_not_called()
+        self.assertEqual(table_names, [f"sheet_{index}" for index in range(12)])
+        self.assertIn("# Table: public.sheet_0", schema)
+        self.assertIn("# Table: public.sheet_11", schema)
+
+    def test_non_excel_schema_still_uses_table_embedding(self):
+        table_objs = make_table_objs(12)
+        ds = SimpleNamespace(type="pg", table_relation=None)
+
+        def limited_tables(tables, question):
+            return tables[:10]
+
+        with (
+            patch.object(datasource_crud, "get_table_obj_by_ds", return_value=table_objs),
+            patch.object(datasource_crud.settings, "TABLE_EMBEDDING_ENABLED", True),
+            patch.object(
+                datasource_crud,
+                "calc_table_embedding",
+                side_effect=limited_tables,
+            ) as calc_embedding,
+        ):
+            schema, table_names = datasource_crud.get_table_schema(
+                session=None,
+                current_user=None,
+                ds=ds,
+                question="sum amount",
+                embedding=True,
+            )
+
+        calc_embedding.assert_called_once()
+        self.assertEqual(table_names, [f"sheet_{index}" for index in range(10)])
+        self.assertIn("# Table: public.sheet_0", schema)
+        self.assertNotIn("# Table: public.sheet_11", schema)
+
+
+if __name__ == "__main__":
+    unittest.main()