diff --git a/api/apps/chunk_app.py b/api/apps/chunk_app.py
index e6ceb66e69..2387dd5d01 100644
--- a/api/apps/chunk_app.py
+++ b/api/apps/chunk_app.py
@@ -498,6 +498,15 @@ async def retrieval_test():
             _question += await keyword_extraction(chat_mdl, _question)
 
         labels = label_question(_question, [kb])
+        highlight_val = req.get("highlight", None)
+        if highlight_val is None:
+            highlight = False
+        elif isinstance(highlight_val, bool):
+            highlight = highlight_val
+        elif isinstance(highlight_val, str):
+            highlight = highlight_val.lower() in ("true", "1", "yes", "on")
+        else:
+            highlight = bool(highlight_val)
         ranks = await settings.retriever.retrieval(
                         _question,
                         embd_mdl,
@@ -510,6 +519,7 @@ async def retrieval_test():
                         doc_ids=local_doc_ids,
                         top=top,
                         rerank_mdl=rerank_mdl,
+                        highlight=highlight,
                         rank_feature=labels
                     )
 
diff --git a/rag/nlp/search.py b/rag/nlp/search.py
index 7ad19fe7c4..5b1e88ad9c 100644
--- a/rag/nlp/search.py
+++ b/rag/nlp/search.py
@@ -654,6 +654,7 @@ class Dealer:
             chunk = self.dataStore.get(cid, idx_nms[0], kb_ids)
             if not chunk:
                 continue
+            has_highlights = any(ck.get("highlight") for ck in chunks)
             d = {
                 "chunk_id": cid,
                 "content_ltks": chunk["content_ltks"],
@@ -670,6 +671,8 @@ class Dealer:
                 "positions": chunk.get("position_int", []),
                 "doc_type_kwd": chunk.get("doc_type_kwd", "")
             }
+            if has_highlights:
+                d["highlight"] = chunk["content_with_weight"]
             for k in chunk.keys():
                 if k[-4:] == "_vec":
                     d["vector"] = chunk[k]
@@ -702,6 +705,7 @@ class Dealer:
         vector_size = 1024
         for id, cks in mom_chunks.items():
             chunk = self.dataStore.get(id, idx_nms[0], [ck["kb_id"] for ck in cks])
+            child_highlights = [ck["highlight"] for ck in cks if ck.get("highlight")]
             d = {
                 "chunk_id": id,
                 "content_ltks": " ".join([ck["content_ltks"] for ck in cks]),
@@ -718,6 +722,8 @@ class Dealer:
                 "positions": chunk.get("position_int", []),
                 "doc_type_kwd": chunk.get("doc_type_kwd", "")
             }
+            if child_highlights:
+                d["highlight"] = " ".join(child_highlights)
             for k in cks[0].keys():
                 if k[-4:] == "_vec":
                     d["vector"] = cks[0][k]
diff --git a/test/testcases/test_web_api/test_chunk_app/test_retrieval_chunks.py b/test/testcases/test_web_api/test_chunk_app/test_retrieval_chunks.py
index 14857210f4..0296bd25f8 100644
--- a/test/testcases/test_web_api/test_chunk_app/test_retrieval_chunks.py
+++ b/test/testcases/test_web_api/test_chunk_app/test_retrieval_chunks.py
@@ -265,8 +265,8 @@ class TestChunksRetrieval:
     @pytest.mark.parametrize(
         "payload, expected_code, expected_highlight, expected_message",
         [
-            pytest.param({"highlight": True}, 0, True, "", marks=pytest.mark.skip(reason="highlight not functionnal")),
-            pytest.param({"highlight": "True"}, 0, True, "", marks=pytest.mark.skip(reason="highlight not functionnal")),
+            ({"highlight": True}, 0, True, ""),
+            ({"highlight": "True"}, 0, True, ""),
             ({"highlight": False}, 0, False, ""),
             ({"highlight": "False"}, 0, False, ""),
             ({"highlight": None}, 0, False, "")
diff --git a/web/src/hooks/use-knowledge-request.ts b/web/src/hooks/use-knowledge-request.ts
index 715707e59c..59e12cad57 100644
--- a/web/src/hooks/use-knowledge-request.ts
+++ b/web/src/hooks/use-knowledge-request.ts
@@ -625,6 +625,7 @@ export const useTestChunkRetrieval = (): ResponsePostType<ITestingResult> & {
       const { data } = await kbService.retrievalTest({
         ...values,
         kb_id: values.kb_id ?? knowledgeBaseId,
+        highlight: true,
         page,
         size: pageSize,
       });
@@ -669,6 +670,7 @@ export const useTestChunkAllRetrieval = (): ResponsePostType<ITestingResult> & {
       const { data } = await kbService.retrievalTest({
         ...values,
         kb_id: values.kb_id ?? knowledgeBaseId,
+        highlight: true,
         doc_ids: [],
         page,
         size: pageSize,
diff --git a/web/src/less/mixins.less b/web/src/less/mixins.less
index c77eac838c..a58268a3a5 100644
--- a/web/src/less/mixins.less
+++ b/web/src/less/mixins.less
@@ -5,7 +5,7 @@
 
 .chunkText() {
   em {
-    color: var(--accent-primary);
+    color: rgb(var(--accent-primary));
     font-style: normal;
   }
   table {
diff --git a/web/src/pages/dataset/testing/testing-result.tsx b/web/src/pages/dataset/testing/testing-result.tsx
index 5dceefee05..fdf7d83a1c 100644
--- a/web/src/pages/dataset/testing/testing-result.tsx
+++ b/web/src/pages/dataset/testing/testing-result.tsx
@@ -1,5 +1,6 @@
 import { EmptyType } from '@/components/empty/constant';
 import Empty from '@/components/empty/empty';
+import HighLightMarkdown from '@/components/highlight-markdown';
 import { FilterButton } from '@/components/list-filter-bar';
 import { FilterPopover } from '@/components/list-filter-bar/filter-popover';
 import { FilterCollection } from '@/components/list-filter-bar/interface';
@@ -91,7 +92,11 @@ export function TestingResult({
                 <article key={x.chunk_id}>
                   <Card className="px-5 py-2.5 bg-transparent shadow-none">
                     <ChunkTitle item={x}></ChunkTitle>
-                    <p className="!mt-2.5"> {x.content_with_weight}</p>
+                    <div className="!mt-2.5">
+                      <HighLightMarkdown>
+                        {x.highlight || x.content_with_weight}
+                      </HighLightMarkdown>
+                    </div>
                   </Card>
                 </article>
               ))}
diff --git a/web/src/pages/next-search/search-view.tsx b/web/src/pages/next-search/search-view.tsx
index 388d78605e..c1a85b4f28 100644
--- a/web/src/pages/next-search/search-view.tsx
+++ b/web/src/pages/next-search/search-view.tsx
@@ -201,7 +201,7 @@ export default function SearchingView({
                               ></ImageWithPopover>
                             )}
                             <HighLightMarkdown>
-                              {chunk.content_with_weight}
+                              {chunk.highlight || chunk.content_with_weight}
                             </HighLightMarkdown>
                           </div>
                           <div