diff --git a/src/core/schema/chat_engines/condense_question/index.ts b/src/core/schema/chat_engines/condense_question/index.ts
index 9dd670cc..26361562 100644
--- a/src/core/schema/chat_engines/condense_question/index.ts
+++ b/src/core/schema/chat_engines/condense_question/index.ts
@@ -8,10 +8,19 @@ export const RetrieverOptionsSchema = z.object({
   top_k: z.coerce.number().int().optional()
 });
 
+export const GraphRetrieverSearchOptionsSchema = z.object({
+  with_degree: z.coerce.boolean().optional(),
+  depth: z.coerce.number().int().optional(),
+  include_meta: z.coerce.boolean().optional(),
+});
+
+export type GraphRetrieverSearchOptions = z.infer<typeof GraphRetrieverSearchOptionsSchema>;
+
 export const GraphRetrieverOptionsSchema = z.object({
   enable: z.coerce.boolean().optional(),
   reranker: RerankerConfigSchema.optional(),
-  top_k: z.coerce.number().int().optional()
+  top_k: z.coerce.number().int().optional(),
+  search: GraphRetrieverSearchOptionsSchema.optional(),
 });
 
 export const BaseChatEngineOptionsSchema = z.object({
diff --git a/src/core/services/llamaindex/chating.ts b/src/core/services/llamaindex/chating.ts
index 629a134f..9d4cb6b6 100644
--- a/src/core/services/llamaindex/chating.ts
+++ b/src/core/services/llamaindex/chating.ts
@@ -2,12 +2,20 @@ import {getDb} from '@/core/db';
 import {type Chat, listChatMessages, updateChatMessage} from '@/core/repositories/chat';
 import {ChatEngineRequiredOptions} from '@/core/repositories/chat_engine';
 import {getDocumentsBySourceUris} from "@/core/repositories/document";
+import {GraphRetrieverSearchOptions} from "@/core/schema/chat_engines/condense_question";
 import {AppChatService, type ChatOptions, type ChatStreamEvent} from '@/core/services/chating';
 import {LlamaindexRetrieverWrapper, LlamaindexRetrieveService} from '@/core/services/llamaindex/retrieving';
 import type {RetrieveOptions} from "@/core/services/retrieving";
 import {type AppChatStreamSource, AppChatStreamState} from '@/lib/ai/AppChatStream';
 import { deduplicateItems } from '@/lib/array-filters';
-import {DocumentChunk, Entity, KnowledgeGraphClient, Relationship, SearchResult} from "@/lib/knowledge-graph/client";
+import {
+  DocumentChunk,
+  Entity,
+  KnowledgeGraphClient,
+  Relationship,
+  SearchOptions,
+  SearchResult
+} from "@/lib/knowledge-graph/client";
 import {uuidToBin} from '@/lib/kysely';
 import {buildEmbedding} from '@/lib/llamaindex/builders/embedding';
 import {buildLLM} from "@/lib/llamaindex/builders/llm";
@@ -59,7 +67,11 @@ const DEFAULT_CHAT_ENGINE_OPTIONS: ChatEngineRequiredOptions = {
     top_k: 5,
   } as RetrieveOptions,
   graph_retriever: {
-    enable: false
+    enable: false,
+    search: {
+      with_degree: false,
+      depth: 1,
+    }
   },
   prompts: {},
   reverse_context: true,
@@ -160,11 +172,15 @@ export class LlamaindexChatService extends AppChatService {
       });
 
       // Knowledge graph searching.
-      const result: KGRetrievalResult = await this.searchKnowledgeGraph(kgClient, options.userInput, kgRetrievalSpan);
+      const result: KGRetrievalResult = await this.searchKnowledgeGraph(
+        kgClient,
+        options.userInput,
+        graphRetrieverConfig.search,
+        kgRetrievalSpan
+      );
 
       // Grouping entities and relationships.
       result.document_relationships = await this.groupDocumentRelationships(result.relationships, result.entities);
-
       if (graphRetrieverConfig.reranker?.provider) {
         // Knowledge graph reranking.
         result.document_relationships = await this.rerankDocumentRelationships(
@@ -358,15 +374,25 @@ export class LlamaindexChatService extends AppChatService {
     await this.langfuse?.flushAsync();
   }
 
-  async searchKnowledgeGraph (kgClient: KnowledgeGraphClient, query: string, trace?: LangfuseTraceClient): Promise<SearchResult> {
+  async searchKnowledgeGraph (
+    kgClient: KnowledgeGraphClient,
+    query: string,
+    searchOptions: GraphRetrieverSearchOptions = {},
+    trace?: LangfuseTraceClient
+  ): Promise<SearchResult> {
     console.log(`[KG-Retrieving] Start knowledge graph searching for query "${query}".`);
     const kgSearchSpan = trace?.span({
       name: "knowledge-graph-search",
       input: query,
+      metadata: searchOptions
     });
 
     const start = DateTime.now();
-    const searchResult = await kgClient.search(query, [], true);
+    const searchResult = await kgClient.search({
+      query,
+      embedding: [],
+      ...searchOptions
+    });
     const duration = DateTime.now().diff(start, 'milliseconds').milliseconds;
 
     kgSearchSpan?.end({
diff --git a/src/lib/knowledge-graph/client.ts b/src/lib/knowledge-graph/client.ts
index 0de9bae3..78353162 100644
--- a/src/lib/knowledge-graph/client.ts
+++ b/src/lib/knowledge-graph/client.ts
@@ -32,6 +32,14 @@ export interface DocumentInfo {
   text: string
 }
 
+export interface SearchOptions {
+  query: string,
+  embedding?: number[]
+  include_meta?: boolean;
+  depth?: number;
+  with_degree?: boolean;
+}
+
 export class KnowledgeGraphClient {
   baseURL: string;
 
@@ -43,18 +51,14 @@ export class KnowledgeGraphClient {
     this.baseURL = baseURL;
   }
 
-  async search(query: string, embedding?: number[], include_meta: boolean = false): Promise<SearchResult> {
+  async search(options?: SearchOptions): Promise<SearchResult> {
     const url = `${this.baseURL}/api/search`;
     const res = await fetch(url, {
       method: 'POST',
       headers: {
         'Content-Type': 'application/json',
       },
-      body: JSON.stringify({
-        query,
-        embedding,
-        include_meta
-      })
+      body: JSON.stringify(options)
     });
     if (!res.ok) {
       throw new Error(`Failed to call knowledge graph search API: ${res.statusText}`);