diff --git a/backend/api/routes/info.py b/backend/api/routes/info.py
index 15ddaa1e..63acaa85 100644
--- a/backend/api/routes/info.py
+++ b/backend/api/routes/info.py
@@ -1,6 +1,6 @@
 from api.core.Gzip import register_gzip_request
 import json
-from fastapi import APIRouter, Body, Request
+from fastapi import APIRouter, Body, Request, Response
 from api.core.Auth import createToken
 from api.core.Response import response
 from api.core.Redis import get_redis_info, get_redis_info_async
@@ -13,6 +13,7 @@ from core.open.skillTree import get_skill_tree_info
 from api.core.exception import ResponseException
 from api.utils.skill_detail import SKILL_DETAIL_NORMALIZE_VERSION, normalize_skill_detail, skill_detail_for_level
 from api.utils.openapi_data import openapi_locale_path
+from api.utils.character_response import character_response_encoding, get_character_response_bytes
 
 router = APIRouter()
 
@@ -39,14 +40,19 @@ async def getToken(redis: RedisDep, alter: str, request: Request, version: str =
 
 @router.get('/character')
 async def get_character_info(request: Request, state: AltersDep, redis: RedisDep):
-    character = createCharacter(state.alter, state.equVersion)
-
     def get_character():
-        return character.getInfo()
+        return createCharacter(state.alter, state.equVersion).getInfo()
 
-    info = get_redis_info(redis, f'dcalc:character:{state.alter}:{state.equVersion}', get_character)
-    # info = character.getInfo()
-    return response(data=info)
+    def load_info():
+        return get_redis_info(redis, f'dcalc:character:{state.alter}:{state.equVersion}', get_character)
+
+    encoding = character_response_encoding(request.headers.get('accept-encoding'))
+    content = get_character_response_bytes(redis, state.alter, state.equVersion, encoding, load_info)
+    headers = {}
+    if encoding == 'gzip':
+        headers['Content-Encoding'] = 'gzip'
+        headers['Vary'] = 'Accept-Encoding'
+    return Response(content=content, media_type='application/json', headers=headers)
 
 
 @router.get('/info/oath/{suitId}/{skillId}')
diff --git a/backend/api/utils/character_response.py b/backend/api/utils/character_response.py
new file mode 100644
index 00000000..52de97ae
--- /dev/null
+++ b/backend/api/utils/character_response.py
@@ -0,0 +1,111 @@
+from collections import OrderedDict
+from collections.abc import Callable
+import gzip
+import logging
+from threading import RLock
+
+from config.main import config
+from api.core.Response import response
+
+
+logger = logging.getLogger('dcalc.character_response')
+
+CHARACTER_RESPONSE_CACHE_VERSION = 'v1'
+CHARACTER_RESPONSE_LOCAL_CACHE_MAX_BYTES = 16 * 1024 * 1024
+
+CharacterInfoLoader = Callable[[], dict]
+CharacterResponseCacheKey = tuple[str, str, str]
+
+_local_cache: OrderedDict[CharacterResponseCacheKey, bytes] = OrderedDict()
+_local_cache_size = 0
+_local_cache_lock = RLock()
+
+
+def character_response_encoding(accept_encoding: str | None) -> str:
+    """Match the application's GZipMiddleware negotiation behavior."""
+    return 'gzip' if 'gzip' in (accept_encoding or '').lower() else 'identity'
+
+
+def character_response_cache_key(alter: str, equ_version: str, encoding: str) -> str:
+    return f'dcalc:character-response:{CHARACTER_RESPONSE_CACHE_VERSION}:{alter}:{equ_version}:{encoding}'
+
+
+def serialize_character_response(info: dict, encoding: str) -> bytes:
+    content = response(data=info).model_dump_json().encode('utf-8')
+    if encoding == 'gzip':
+        return gzip.compress(content, compresslevel=9, mtime=0)
+    return content
+
+
+def clear_character_response_local_cache() -> None:
+    global _local_cache_size
+    with _local_cache_lock:
+        _local_cache.clear()
+        _local_cache_size = 0
+
+
+def _get_local_cache(key: CharacterResponseCacheKey) -> bytes | None:
+    with _local_cache_lock:
+        content = _local_cache.pop(key, None)
+        if content is not None:
+            _local_cache[key] = content
+        return content
+
+
+def _set_local_cache(key: CharacterResponseCacheKey, content: bytes) -> None:
+    global _local_cache_size
+    if len(content) > CHARACTER_RESPONSE_LOCAL_CACHE_MAX_BYTES:
+        return
+
+    with _local_cache_lock:
+        previous = _local_cache.pop(key, None)
+        if previous is not None:
+            _local_cache_size -= len(previous)
+        _local_cache[key] = content
+        _local_cache_size += len(content)
+
+        while _local_cache_size > CHARACTER_RESPONSE_LOCAL_CACHE_MAX_BYTES:
+            _, evicted = _local_cache.popitem(last=False)
+            _local_cache_size -= len(evicted)
+
+
+def _get_redis_cache(redis, key: str) -> bytes | None:
+    if config.DEBUG_MODE or redis is None:
+        return None
+    try:
+        content = redis.get(key)
+        return bytes(content) if content is not None else None
+    except Exception:
+        logger.warning('read character response cache failed key=%s', key, exc_info=True)
+        return None
+
+
+def _set_redis_cache(redis, key: str, content: bytes) -> None:
+    if config.DEBUG_MODE or redis is None:
+        return
+    try:
+        redis.set(key, content)
+    except Exception:
+        logger.warning('write character response cache failed key=%s', key, exc_info=True)
+
+
+def get_character_response_bytes(
+    redis,
+    alter: str,
+    equ_version: str,
+    encoding: str,
+    load_info: CharacterInfoLoader,
+) -> bytes:
+    local_key = (alter, equ_version, encoding)
+    content = _get_local_cache(local_key)
+    if content is not None:
+        return content
+
+    redis_key = character_response_cache_key(alter, equ_version, encoding)
+    content = _get_redis_cache(redis, redis_key)
+    if content is None:
+        content = serialize_character_response(load_info(), encoding)
+        _set_redis_cache(redis, redis_key, content)
+
+    _set_local_cache(local_key, content)
+    return content
diff --git a/backend/tests/contract/test_calc_contract.py b/backend/tests/contract/test_calc_contract.py
index 81cab551..290e4919 100644
--- a/backend/tests/contract/test_calc_contract.py
+++ b/backend/tests/contract/test_calc_contract.py
@@ -17,3 +17,30 @@ def test_calc_response_contract(client, alter_token, minimal_calc_config):
     assert isinstance(data['skills'], list)
     assert isinstance(data['info'], list)
     assert isinstance(data['buffer'], bool)
+
+
+def test_character_response_contract_with_gzip(client, alter_token):
+    response = client.get(
+        '/api/character',
+        headers={'alter-token': alter_token, 'accept-encoding': 'gzip'},
+    )
+
+    assert response.status_code == 200
+    assert response.headers['content-encoding'] == 'gzip'
+    assert response.headers['vary'] == 'Accept-Encoding'
+    payload = response.json()
+    assert payload['code'] == 200
+    assert payload['message'] == 'Success'
+    assert set(['alter', 'skills', 'equips', 'suits']).issubset(payload['data'])
+
+
+def test_character_response_contract_without_gzip(client, alter_token):
+    response = client.get(
+        '/api/character',
+        headers={'alter-token': alter_token, 'accept-encoding': 'identity'},
+    )
+
+    assert response.status_code == 200
+    assert 'content-encoding' not in response.headers
+    assert response.headers['vary'] == 'Accept-Encoding'
+    assert response.json()['code'] == 200
diff --git a/backend/tests/unit/test_character_response.py b/backend/tests/unit/test_character_response.py
new file mode 100644
index 00000000..cbbda41d
--- /dev/null
+++ b/backend/tests/unit/test_character_response.py
@@ -0,0 +1,98 @@
+import gzip
+import json
+
+from api.utils.character_response import (
+    character_response_cache_key,
+    character_response_encoding,
+    clear_character_response_local_cache,
+    get_character_response_bytes,
+)
+from config.main import config
+
+
+def setup_function():
+    clear_character_response_local_cache()
+
+
+def teardown_function():
+    clear_character_response_local_cache()
+
+
+def test_character_response_encoding_matches_gzip_middleware():
+    assert character_response_encoding('gzip, deflate, br') == 'gzip'
+    assert character_response_encoding('identity') == 'identity'
+    assert character_response_encoding(None) == 'identity'
+
+
+def test_character_response_caches_final_gzip_bytes_locally():
+    calls = 0
+
+    def load_info():
+        nonlocal calls
+        calls += 1
+        return {'alter': 'weapon_master', 'skills': []}
+
+    first = get_character_response_bytes(None, 'GF.swordman_male.weapon_master', '0', 'gzip', load_info)
+    second = get_character_response_bytes(None, 'GF.swordman_male.weapon_master', '0', 'gzip', load_info)
+
+    assert first == second
+    assert calls == 1
+    assert json.loads(gzip.decompress(first)) == {
+        'code': 200,
+        'message': 'Success',
+        'data': {'alter': 'weapon_master', 'skills': []},
+    }
+
+
+def test_character_response_caches_identity_and_gzip_separately():
+    calls = 0
+
+    def load_info():
+        nonlocal calls
+        calls += 1
+        return {'name': '极诣·剑魂'}
+
+    identity = get_character_response_bytes(None, 'GF.swordman_male.weapon_master', '0', 'identity', load_info)
+    compressed = get_character_response_bytes(None, 'GF.swordman_male.weapon_master', '0', 'gzip', load_info)
+
+    assert calls == 2
+    assert gzip.decompress(compressed) == identity
+    assert json.loads(identity)['data']['name'] == '极诣·剑魂'
+
+
+def test_character_response_reuses_redis_final_bytes_after_local_cache_clear(monkeypatch):
+    class FakeRedis:
+        def __init__(self):
+            self.values = {}
+
+        def get(self, key):
+            return self.values.get(key)
+
+        def set(self, key, value):
+            self.values[key] = value
+
+    redis = FakeRedis()
+    monkeypatch.setattr(config, 'DEBUG_MODE', False)
+    first = get_character_response_bytes(
+        redis,
+        'GF.swordman_male.weapon_master',
+        '0',
+        'gzip',
+        lambda: {'alter': 'weapon_master'},
+    )
+    clear_character_response_local_cache()
+
+    def fail_to_load_info():
+        raise AssertionError('Redis cache hit must not rebuild character info')
+
+    second = get_character_response_bytes(
+        redis,
+        'GF.swordman_male.weapon_master',
+        '0',
+        'gzip',
+        fail_to_load_info,
+    )
+
+    redis_key = character_response_cache_key('GF.swordman_male.weapon_master', '0', 'gzip')
+    assert redis.values[redis_key] == first
+    assert second == first