diff --git a/api/core/workflow/nodes/knowledge_retrieval/entities.py b/api/core/workflow/nodes/knowledge_retrieval/entities.py
index 6f45af1a14..7fde733eb5 100644
--- a/api/core/workflow/nodes/knowledge_retrieval/entities.py
+++ b/api/core/workflow/nodes/knowledge_retrieval/entities.py
@@ -116,20 +116,10 @@ class MetadataFilteringCondition(BaseModel):
     logical_operator: Optional[Literal["and", "or"]] = "and"
     conditions: Optional[list[Condition]] = Field(default=None, deprecated=True)
 
-
-class MetadataFilteringComplexSubCondition(BaseModel):
-    logical_operator: Optional[Literal["and", "or"]] = "and"
-    conditions: Optional[list[Condition]] = Field(default=None, deprecated=True)
-    sub_conditions: Optional[list["MetadataFilteringComplexSubCondition"]] = None
-
-
 class MetadataFilteringComplexCondition(BaseModel):
-    """
-    Complex Metadata Filtering Condition.
-    """
-
     logical_operator: Optional[Literal["and", "or"]] = "and"
-    conditions: Optional[list[MetadataFilteringComplexSubCondition]] = Field(default=None, deprecated=True)
+    conditions: Optional[list[Condition]] = Field(default=None, deprecated=True)
+    sub_conditions: Optional[list["MetadataFilteringComplexCondition"]] = None
 
 
 class KnowledgeRetrievalNodeData(BaseNodeData):
diff --git a/api/core/workflow/nodes/knowledge_retrieval/knowledge_retrieval_node.py b/api/core/workflow/nodes/knowledge_retrieval/knowledge_retrieval_node.py
index 4e5cc56ea6..2af78c72e0 100644
--- a/api/core/workflow/nodes/knowledge_retrieval/knowledge_retrieval_node.py
+++ b/api/core/workflow/nodes/knowledge_retrieval/knowledge_retrieval_node.py
@@ -47,7 +47,6 @@ from services.feature_service import FeatureService
 from .entities import (
     KnowledgeRetrievalNodeData,
     MetadataFilteringComplexCondition,
-    MetadataFilteringComplexSubCondition,
     ModelConfig,
 )
 from .exc import (
@@ -322,7 +321,7 @@ class KnowledgeRetrievalNode(LLMNode):
         return retrieval_resource_list
 
     def _recursive_metadata_filter(
-        self, metadata_filtering_complex_conditions: MetadataFilteringComplexSubCondition, filters
+        self, metadata_filtering_complex_conditions: MetadataFilteringComplexCondition, filters
     ):
         logical_operator = metadata_filtering_complex_conditions.logical_operator
         conditions = metadata_filtering_complex_conditions.conditions
@@ -331,8 +330,8 @@ class KnowledgeRetrievalNode(LLMNode):
         sub_filters = []
         if sub_conditions:
             for sub_condition in sub_conditions:
-                sub_filter = self._recursive_metadata_filter(sub_condition, filters)
-                sub_filters.append(sub_filter)
+                sub_filter = self._recursive_metadata_filter(sub_condition, [])
+                sub_filters.extend(sub_filter)
 
         temp_filters: list = []
         if conditions:
@@ -357,16 +356,27 @@ class KnowledgeRetrievalNode(LLMNode):
                         expected_value,
                         temp_filters,
                     )
-        temp_filters_result: ColumnElement[bool]
-        if temp_filters:
+        
+        sub_filters_result: ColumnElement
+        temp_filters_result: ColumnElement
+        if temp_filters and sub_filters:
+            temp_all_filters = sub_filters +temp_filters
+            if logical_operator == "and":  # type: ignore
+                sub_filters_result = and_(*temp_all_filters)
+            else:
+                sub_filters_result = or_(*temp_all_filters)
+            filters.append(sub_filters_result)
+            return filters
+                    
+        if temp_filters: # text
             if logical_operator == "and":  # type: ignore
                 temp_filters_result = and_(*temp_filters)
             else:
                 temp_filters_result = or_(*temp_filters)
             filters.append(temp_filters_result)
+            return filters
 
-        sub_filters_result: ColumnElement[bool]
-        if sub_filters:
+        if sub_filters: # Boolean
             if logical_operator == "and":  # type: ignore
                 sub_filters_result = and_(*sub_filters)
             else:
@@ -375,6 +385,7 @@ class KnowledgeRetrievalNode(LLMNode):
 
         return filters
 
+
     def _get_metadata_filter_condition(
         self, dataset_ids: list, query: str, node_data: KnowledgeRetrievalNodeData
     ) -> tuple[Optional[dict[str, list[str]]], Optional[MetadataCondition]]:
@@ -392,17 +403,13 @@ class KnowledgeRetrievalNode(LLMNode):
             # todo: do not support external_knowledge_retrieval
             if node_data.metadata_filtering_complex_conditions:
                 # Enable forward references
-                MetadataFilteringComplexSubCondition.model_rebuild()
+                MetadataFilteringComplexCondition.model_rebuild()
                 metadata_filtering_complex_conditions = MetadataFilteringComplexCondition(
                     **node_data.metadata_filtering_complex_conditions.model_dump()
                 )
-                for condition in metadata_filtering_complex_conditions.conditions:  # type: ignore
-                    filters = self._recursive_metadata_filter(condition, filters)
+                filters = self._recursive_metadata_filter(metadata_filtering_complex_conditions, filters)
                 if filters:
-                    if metadata_filtering_complex_conditions.logical_operator == "and":  # type: ignore
-                        document_query = document_query.filter(and_(*filters))
-                    else:
-                        document_query = document_query.filter(or_(*filters))
+                    document_query = document_query.filter(*filters)
             documents = document_query.all()
             # group by dataset_id
             metadata_filter_document_ids = defaultdict(list) if documents else None  # type: ignore