diff --git a/.gitignore b/.gitignore
index 5c68d89a4..30432c430 100644
--- a/.gitignore
+++ b/.gitignore
@@ -197,6 +197,8 @@ sdks/python-client/dify_client.egg-info
 !.vscode/README.md
 pyrightconfig.json
 api/.vscode
+# vscode Code History Extension
+.history
 
 .idea/
 
diff --git a/api/core/rag/datasource/vdb/qdrant/qdrant_vector.py b/api/core/rag/datasource/vdb/qdrant/qdrant_vector.py
index 9741dd8b1..fcf3a6d12 100644
--- a/api/core/rag/datasource/vdb/qdrant/qdrant_vector.py
+++ b/api/core/rag/datasource/vdb/qdrant/qdrant_vector.py
@@ -331,6 +331,12 @@ class QdrantVector(BaseVector):
     def search_by_vector(self, query_vector: list[float], **kwargs: Any) -> list[Document]:
         from qdrant_client.http import models
 
+        score_threshold = float(kwargs.get("score_threshold") or 0.0)
+        if score_threshold >= 1:
+            # return empty list because some versions of qdrant may response with 400 bad request，
+            # and at the same time, the score_threshold with value 1 may be valid for other vector stores
+            return []
+
         filter = models.Filter(
             must=[
                 models.FieldCondition(
@@ -355,7 +361,7 @@ class QdrantVector(BaseVector):
             limit=kwargs.get("top_k", 4),
             with_payload=True,
             with_vectors=True,
-            score_threshold=float(kwargs.get("score_threshold") or 0.0),
+            score_threshold=score_threshold,
         )
         docs = []
         for result in results:
@@ -363,7 +369,6 @@ class QdrantVector(BaseVector):
                 continue
             metadata = result.payload.get(Field.METADATA_KEY.value) or {}
             # duplicate check score threshold
-            score_threshold = float(kwargs.get("score_threshold") or 0.0)
             if result.score > score_threshold:
                 metadata["score"] = result.score
                 doc = Document(
diff --git a/api/tests/integration_tests/vdb/qdrant/test_qdrant.py b/api/tests/integration_tests/vdb/qdrant/test_qdrant.py
index 61d9a9e71..fe0e03f7b 100644
--- a/api/tests/integration_tests/vdb/qdrant/test_qdrant.py
+++ b/api/tests/integration_tests/vdb/qdrant/test_qdrant.py
@@ -1,4 +1,5 @@
 from core.rag.datasource.vdb.qdrant.qdrant_vector import QdrantConfig, QdrantVector
+from core.rag.models.document import Document
 from tests.integration_tests.vdb.test_vector_store import (
     AbstractVectorTest,
     setup_mock_redis,
@@ -18,6 +19,14 @@ class QdrantVectorTest(AbstractVectorTest):
             ),
         )
 
+    def search_by_vector(self):
+        super().search_by_vector()
+        # only test for qdrant, may not work on other vector stores
+        hits_by_vector: list[Document] = self.vector.search_by_vector(
+            query_vector=self.example_embedding, score_threshold=1
+        )
+        assert len(hits_by_vector) == 0
+
 
 def test_qdrant_vector(setup_mock_redis):
     QdrantVectorTest().run_all_tests()