diff --git a/app/server/somni/quiz/rpc.py b/app/server/somni/quiz/rpc.py
index 593d1ed..713c77f 100644
--- a/app/server/somni/quiz/rpc.py
+++ b/app/server/somni/quiz/rpc.py
@@ -2,10 +2,9 @@
 
 from __future__ import annotations
 
+import json
 from typing import TYPE_CHECKING, Any
 
-from google.protobuf.json_format import ParseDict
-
 from app.core.exceptions import ServiceNotReadyError
 from app.server.errors import abort_from_app_error, abort_invalid, run_rpc_call
 from app.uburnode_grpc.grpc_gen import uburnode_somni_pb2, uburnode_somni_pb2_grpc
@@ -36,20 +35,17 @@ async def _require(self, context) -> QuizService:
 
 
 def _to_res(payload: dict[str, Any]) -> uburnode_somni_pb2.GetAnswerRes:
-    res = uburnode_somni_pb2.GetAnswerRes()
-    for item in payload.get("answers") or []:
-        res.answers.append(_to_item(item if isinstance(item, dict) else {}))
-    return res
-
-
-def _to_item(item: dict[str, Any]) -> uburnode_somni_pb2.AnswerItem:
-    answer = uburnode_somni_pb2.AnswerItem(
-        question_id=str(item.get("question_id") or ""),
-        input_type=str(item.get("input_type") or ""),
-        title=str(item.get("title") or ""),
-        extra_input=str(item.get("extra_input") or ""),
+    items = [
+        {
+            "question_id": str(item.get("question_id") or ""),
+            "input_type": str(item.get("input_type") or ""),
+            "title": str(item.get("title") or ""),
+            "value": item.get("value"),
+            "extra_input": str(item.get("extra_input") or ""),
+        }
+        for item in (payload.get("answers") or [])
+        if isinstance(item, dict)
+    ]
+    return uburnode_somni_pb2.GetAnswerRes(
+        answers=json.dumps(items, ensure_ascii=False, separators=(",", ":")),
     )
-    raw = item.get("value")
-    if raw is not None:
-        ParseDict(raw, answer.value)
-    return answer
diff --git a/app/uburnode_grpc/grpc_gen/uburnode_somni_pb2.py b/app/uburnode_grpc/grpc_gen/uburnode_somni_pb2.py
index 9edcc40..e9c8ae2 100644
--- a/app/uburnode_grpc/grpc_gen/uburnode_somni_pb2.py
+++ b/app/uburnode_grpc/grpc_gen/uburnode_somni_pb2.py
@@ -25,7 +25,7 @@
 from google.protobuf import struct_pb2 as google_dot_protobuf_dot_struct__pb2
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x14uburnode_somni.proto\x12\x11uburnode.somni.v1\x1a\x1cgoogle/protobuf/struct.proto\".\n\x0cGetAnswerReq\x12\x0b\n\x03uid\x18\x01 \x01(\t\x12\x11\n\tanswer_id\x18\x02 \x01(\t\"\x94\x01\n\nAnswerItem\x12\x13\n\x0bquestion_id\x18\x01 \x01(\t\x12\x12\n\ninput_type\x18\x02 \x01(\t\x12\r\n\x05title\x18\x03 \x01(\t\x12%\n\x05value\x18\x05 \x01(\x0b\x32\x16.google.protobuf.Value\x12\x13\n\x0b\x65xtra_input\x18\x06 \x01(\tJ\x04\x08\x04\x10\x05R\x04tagsR\x06values\">\n\x0cGetAnswerRes\x12.\n\x07\x61nswers\x18\x01 \x03(\x0b\x32\x1d.uburnode.somni.v1.AnswerItem\"1\n\rReportDateReq\x12\x0b\n\x03uid\x18\x01 \x01(\t\x12\x13\n\x0brecord_date\x18\x02 \x01(\t\"\x0f\n\rGetSummaryRes\"\x0e\n\x0cGetEventsRes\"\x13\n\x11GetEnvironmentRes\"\x11\n\x0fGetStructureRes\"\x14\n\x12GetSleepQualityRes\"\xc1\x01\n\x0bGetAudioReq\x12\x11\n\x04page\x18\x01 \x01(\x05H\x00\x88\x01\x01\x12\x16\n\tpage_size\x18\x02 \x01(\x05H\x01\x88\x01\x01\x12\x16\n\tfetch_all\x18\x03 \x01(\x08H\x02\x88\x01\x01\x12\x17\n\nquery_text\x18\x04 \x01(\tH\x03\x88\x01\x01\x12\x15\n\x08tag_code\x18\x05 \x01(\tH\x04\x88\x01\x01\x42\x07\n\x05_pageB\x0c\n\n_page_sizeB\x0c\n\n_fetch_allB\r\n\x0b_query_textB\x0b\n\t_tag_code\"O\n\x08PageInfo\x12\x0c\n\x04page\x18\x01 \x01(\x05\x12\x11\n\tpage_size\x18\x02 \x01(\x05\x12\r\n\x05total\x18\x03 \x01(\x05\x12\x13\n\x0btotal_pages\x18\x04 \x01(\x05\"d\n\x0bGetAudioRes\x12*\n\tmaterials\x18\x01 \x03(\x0b\x32\x17.google.protobuf.Struct\x12)\n\x04page\x18\x02 \x01(\x0b\x32\x1b.uburnode.somni.v1.PageInfo\"\x10\n\x0eGetAudioTagReq\"H\n\x0bTagDictItem\x12\x0c\n\x04type\x18\x01 \x01(\t\x12\x0c\n\x04\x63ode\x18\x02 \x01(\t\x12\x0c\n\x04name\x18\x03 \x01(\t\x12\x0f\n\x07name_en\x18\x04 \x01(\t\">\n\x0eGetAudioTagRes\x12,\n\x04tags\x18\x01 \x03(\x0b\x32\x1e.uburnode.somni.v1.TagDictItem\"\x0b\n\tGetHotReq\"\x0b\n\tGetHotRes2\\\n\x0bQuizService\x12M\n\tGetAnswer\x12\x1f.uburnode.somni.v1.GetAnswerReq\x1a\x1f.uburnode.somni.v1.GetAnswerRes2\xbd\x03\n\rReportService\x12P\n\nGetSummary\x12 .uburnode.somni.v1.ReportDateReq\x1a .uburnode.somni.v1.GetSummaryRes\x12N\n\tGetEvents\x12 .uburnode.somni.v1.ReportDateReq\x1a\x1f.uburnode.somni.v1.GetEventsRes\x12X\n\x0eGetEnvironment\x12 .uburnode.somni.v1.ReportDateReq\x1a$.uburnode.somni.v1.GetEnvironmentRes\x12T\n\x0cGetStructure\x12 .uburnode.somni.v1.ReportDateReq\x1a\".uburnode.somni.v1.GetStructureRes\x12Z\n\x0fGetSleepQuality\x12 .uburnode.somni.v1.ReportDateReq\x1a%.uburnode.somni.v1.GetSleepQualityRes2\xf5\x01\n\x0c\x41udioService\x12J\n\x08GetAudio\x12\x1e.uburnode.somni.v1.GetAudioReq\x1a\x1e.uburnode.somni.v1.GetAudioRes\x12S\n\x0bGetAudioTag\x12!.uburnode.somni.v1.GetAudioTagReq\x1a!.uburnode.somni.v1.GetAudioTagRes\x12\x44\n\x06GetHot\x12\x1c.uburnode.somni.v1.GetHotReq\x1a\x1c.uburnode.somni.v1.GetHotResb\x06proto3')
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x14uburnode_somni.proto\x12\x11uburnode.somni.v1\x1a\x1cgoogle/protobuf/struct.proto\".\n\x0cGetAnswerReq\x12\x0b\n\x03uid\x18\x01 \x01(\t\x12\x11\n\tanswer_id\x18\x02 \x01(\t\"\x1f\n\x0cGetAnswerRes\x12\x0f\n\x07\x61nswers\x18\x01 \x01(\t\"1\n\rReportDateReq\x12\x0b\n\x03uid\x18\x01 \x01(\t\x12\x13\n\x0brecord_date\x18\x02 \x01(\t\"\x0f\n\rGetSummaryRes\"\x0e\n\x0cGetEventsRes\"\x13\n\x11GetEnvironmentRes\"\x11\n\x0fGetStructureRes\"\x14\n\x12GetSleepQualityRes\"\xc1\x01\n\x0bGetAudioReq\x12\x11\n\x04page\x18\x01 \x01(\x05H\x00\x88\x01\x01\x12\x16\n\tpage_size\x18\x02 \x01(\x05H\x01\x88\x01\x01\x12\x16\n\tfetch_all\x18\x03 \x01(\x08H\x02\x88\x01\x01\x12\x17\n\nquery_text\x18\x04 \x01(\tH\x03\x88\x01\x01\x12\x15\n\x08tag_code\x18\x05 \x01(\tH\x04\x88\x01\x01\x42\x07\n\x05_pageB\x0c\n\n_page_sizeB\x0c\n\n_fetch_allB\r\n\x0b_query_textB\x0b\n\t_tag_code\"O\n\x08PageInfo\x12\x0c\n\x04page\x18\x01 \x01(\x05\x12\x11\n\tpage_size\x18\x02 \x01(\x05\x12\r\n\x05total\x18\x03 \x01(\x05\x12\x13\n\x0btotal_pages\x18\x04 \x01(\x05\"d\n\x0bGetAudioRes\x12*\n\tmaterials\x18\x01 \x03(\x0b\x32\x17.google.protobuf.Struct\x12)\n\x04page\x18\x02 \x01(\x0b\x32\x1b.uburnode.somni.v1.PageInfo\"\x10\n\x0eGetAudioTagReq\"H\n\x0bTagDictItem\x12\x0c\n\x04type\x18\x01 \x01(\t\x12\x0c\n\x04\x63ode\x18\x02 \x01(\t\x12\x0c\n\x04name\x18\x03 \x01(\t\x12\x0f\n\x07name_en\x18\x04 \x01(\t\">\n\x0eGetAudioTagRes\x12,\n\x04tags\x18\x01 \x03(\x0b\x32\x1e.uburnode.somni.v1.TagDictItem\"\x0b\n\tGetHotReq\"\x0b\n\tGetHotRes2\\\n\x0bQuizService\x12M\n\tGetAnswer\x12\x1f.uburnode.somni.v1.GetAnswerReq\x1a\x1f.uburnode.somni.v1.GetAnswerRes2\xbd\x03\n\rReportService\x12P\n\nGetSummary\x12 .uburnode.somni.v1.ReportDateReq\x1a .uburnode.somni.v1.GetSummaryRes\x12N\n\tGetEvents\x12 .uburnode.somni.v1.ReportDateReq\x1a\x1f.uburnode.somni.v1.GetEventsRes\x12X\n\x0eGetEnvironment\x12 .uburnode.somni.v1.ReportDateReq\x1a$.uburnode.somni.v1.GetEnvironmentRes\x12T\n\x0cGetStructure\x12 .uburnode.somni.v1.ReportDateReq\x1a\".uburnode.somni.v1.GetStructureRes\x12Z\n\x0fGetSleepQuality\x12 .uburnode.somni.v1.ReportDateReq\x1a%.uburnode.somni.v1.GetSleepQualityRes2\xf5\x01\n\x0c\x41udioService\x12J\n\x08GetAudio\x12\x1e.uburnode.somni.v1.GetAudioReq\x1a\x1e.uburnode.somni.v1.GetAudioRes\x12S\n\x0bGetAudioTag\x12!.uburnode.somni.v1.GetAudioTagReq\x1a!.uburnode.somni.v1.GetAudioTagRes\x12\x44\n\x06GetHot\x12\x1c.uburnode.somni.v1.GetHotReq\x1a\x1c.uburnode.somni.v1.GetHotResb\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -34,42 +34,40 @@
   DESCRIPTOR._loaded_options = None
   _globals['_GETANSWERREQ']._serialized_start=73
   _globals['_GETANSWERREQ']._serialized_end=119
-  _globals['_ANSWERITEM']._serialized_start=122
-  _globals['_ANSWERITEM']._serialized_end=270
-  _globals['_GETANSWERRES']._serialized_start=272
-  _globals['_GETANSWERRES']._serialized_end=334
-  _globals['_REPORTDATEREQ']._serialized_start=336
-  _globals['_REPORTDATEREQ']._serialized_end=385
-  _globals['_GETSUMMARYRES']._serialized_start=387
-  _globals['_GETSUMMARYRES']._serialized_end=402
-  _globals['_GETEVENTSRES']._serialized_start=404
-  _globals['_GETEVENTSRES']._serialized_end=418
-  _globals['_GETENVIRONMENTRES']._serialized_start=420
-  _globals['_GETENVIRONMENTRES']._serialized_end=439
-  _globals['_GETSTRUCTURERES']._serialized_start=441
-  _globals['_GETSTRUCTURERES']._serialized_end=458
-  _globals['_GETSLEEPQUALITYRES']._serialized_start=460
-  _globals['_GETSLEEPQUALITYRES']._serialized_end=480
-  _globals['_GETAUDIOREQ']._serialized_start=483
-  _globals['_GETAUDIOREQ']._serialized_end=676
-  _globals['_PAGEINFO']._serialized_start=678
-  _globals['_PAGEINFO']._serialized_end=757
-  _globals['_GETAUDIORES']._serialized_start=759
-  _globals['_GETAUDIORES']._serialized_end=859
-  _globals['_GETAUDIOTAGREQ']._serialized_start=861
-  _globals['_GETAUDIOTAGREQ']._serialized_end=877
-  _globals['_TAGDICTITEM']._serialized_start=879
-  _globals['_TAGDICTITEM']._serialized_end=951
-  _globals['_GETAUDIOTAGRES']._serialized_start=953
-  _globals['_GETAUDIOTAGRES']._serialized_end=1015
-  _globals['_GETHOTREQ']._serialized_start=1017
-  _globals['_GETHOTREQ']._serialized_end=1028
-  _globals['_GETHOTRES']._serialized_start=1030
-  _globals['_GETHOTRES']._serialized_end=1041
-  _globals['_QUIZSERVICE']._serialized_start=1043
-  _globals['_QUIZSERVICE']._serialized_end=1135
-  _globals['_REPORTSERVICE']._serialized_start=1138
-  _globals['_REPORTSERVICE']._serialized_end=1583
-  _globals['_AUDIOSERVICE']._serialized_start=1586
-  _globals['_AUDIOSERVICE']._serialized_end=1831
+  _globals['_GETANSWERRES']._serialized_start=121
+  _globals['_GETANSWERRES']._serialized_end=152
+  _globals['_REPORTDATEREQ']._serialized_start=154
+  _globals['_REPORTDATEREQ']._serialized_end=203
+  _globals['_GETSUMMARYRES']._serialized_start=205
+  _globals['_GETSUMMARYRES']._serialized_end=220
+  _globals['_GETEVENTSRES']._serialized_start=222
+  _globals['_GETEVENTSRES']._serialized_end=236
+  _globals['_GETENVIRONMENTRES']._serialized_start=238
+  _globals['_GETENVIRONMENTRES']._serialized_end=257
+  _globals['_GETSTRUCTURERES']._serialized_start=259
+  _globals['_GETSTRUCTURERES']._serialized_end=276
+  _globals['_GETSLEEPQUALITYRES']._serialized_start=278
+  _globals['_GETSLEEPQUALITYRES']._serialized_end=298
+  _globals['_GETAUDIOREQ']._serialized_start=301
+  _globals['_GETAUDIOREQ']._serialized_end=494
+  _globals['_PAGEINFO']._serialized_start=496
+  _globals['_PAGEINFO']._serialized_end=575
+  _globals['_GETAUDIORES']._serialized_start=577
+  _globals['_GETAUDIORES']._serialized_end=677
+  _globals['_GETAUDIOTAGREQ']._serialized_start=679
+  _globals['_GETAUDIOTAGREQ']._serialized_end=695
+  _globals['_TAGDICTITEM']._serialized_start=697
+  _globals['_TAGDICTITEM']._serialized_end=769
+  _globals['_GETAUDIOTAGRES']._serialized_start=771
+  _globals['_GETAUDIOTAGRES']._serialized_end=833
+  _globals['_GETHOTREQ']._serialized_start=835
+  _globals['_GETHOTREQ']._serialized_end=846
+  _globals['_GETHOTRES']._serialized_start=848
+  _globals['_GETHOTRES']._serialized_end=859
+  _globals['_QUIZSERVICE']._serialized_start=861
+  _globals['_QUIZSERVICE']._serialized_end=953
+  _globals['_REPORTSERVICE']._serialized_start=956
+  _globals['_REPORTSERVICE']._serialized_end=1401
+  _globals['_AUDIOSERVICE']._serialized_start=1404
+  _globals['_AUDIOSERVICE']._serialized_end=1649
 # @@protoc_insertion_point(module_scope)
diff --git a/proto/uburnode_somni.proto b/proto/uburnode_somni.proto
index bfa813d..b2fa765 100644
--- a/proto/uburnode_somni.proto
+++ b/proto/uburnode_somni.proto
@@ -11,19 +11,9 @@ message GetAnswerReq {
   string answer_id = 2;  // 必传：答卷 _id
 }
 
-message AnswerItem {
-  string question_id = 1;
-  string input_type = 2;
-  string title = 3;
-  reserved 4;
-  reserved "tags";
-  reserved "values";
-  google.protobuf.Value value = 5;
-  string extra_input = 6;
-}
-
+// answers 为整份答卷数组的 JSON 文本（与库 answers 同形），客户端一次 JSON.parse。
 message GetAnswerRes {
-  repeated AnswerItem answers = 1;
+  string answers = 1;
 }
 
 service QuizService {
diff --git a/tests/test_grpc_quiz.py b/tests/test_grpc_quiz.py
index 5aeec4b..cf4e69c 100644
--- a/tests/test_grpc_quiz.py
+++ b/tests/test_grpc_quiz.py
@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import json
 from unittest.mock import AsyncMock, MagicMock
 
 import grpc
@@ -101,21 +102,24 @@ async def test_somni_get_answer_maps_answer_item() -> None:
         _context(),
     )
     payload = MessageToDict(res, preserving_proto_field_name=True)
-    assert len(payload["answers"]) == 5
-    assert payload["answers"][0]["value"] == {
-        "option_id": "A",
-        "option_text": "先生",
+    answers = json.loads(payload["answers"])
+    assert len(answers) == 5
+    assert answers[0] == {
+        "question_id": "q1",
+        "input_type": "radio",
+        "title": "您的性别是？",
+        "value": {"option_id": "A", "option_text": "先生"},
+        "extra_input": "",
     }
-    assert payload["answers"][1]["value"] == [
+    assert "tags" not in answers[0]
+    assert answers[1]["value"] == [
         {"option_id": "A", "option_text": "早期"},
         {"option_id": "B", "option_text": "VC"},
     ]
-    assert payload["answers"][2]["value"] == 2
-    assert payload["answers"][3]["value"] == "最近压力比较大"
-    assert payload["answers"][4]["value"] is True
-    assert "tags" not in payload["answers"][0]
-    assert "values" not in payload["answers"][0]
-
+    assert answers[2]["value"] == 2
+    assert answers[3]["value"] == "最近压力比较大"
+    assert answers[4]["value"] is True
+    assert json.loads(res.answers)[0]["title"] == "您的性别是？"
 
 @pytest.mark.asyncio
 async def test_somni_quiz_service_loads_from_collection() -> None:
diff --git a/tests/test_uburnode_proto_import.py b/tests/test_uburnode_proto_import.py
index 5a2deac..69ce72b 100644
--- a/tests/test_uburnode_proto_import.py
+++ b/tests/test_uburnode_proto_import.py
@@ -21,8 +21,7 @@ def test_somni_package() -> None:
     assert hasattr(uburnode_somni_pb2_grpc, "AudioServiceServicer")
     quiz = uburnode_somni_pb2.DESCRIPTOR.services_by_name["QuizService"]
     assert quiz.full_name == "uburnode.somni.v1.QuizService"
-    assert "tags" not in uburnode_somni_pb2.AnswerItem.DESCRIPTOR.fields_by_name
-    assert "values" not in uburnode_somni_pb2.AnswerItem.DESCRIPTOR.fields_by_name
-    value_field = uburnode_somni_pb2.AnswerItem.DESCRIPTOR.fields_by_name["value"]
-    assert value_field.number == 5
-    assert value_field.message_type.full_name == "google.protobuf.Value"
+    assert "AnswerItem" not in uburnode_somni_pb2.DESCRIPTOR.message_types_by_name
+    answers_field = uburnode_somni_pb2.GetAnswerRes.DESCRIPTOR.fields_by_name["answers"]
+    assert answers_field.type == answers_field.TYPE_STRING
+    assert not answers_field.is_repeated