diff --git a/fastdeploy/envs.py b/fastdeploy/envs.py
index f5aa5dc7e9..cbf3256dc1 100644
--- a/fastdeploy/envs.py
+++ b/fastdeploy/envs.py
@@ -79,7 +79,7 @@
     # set traec exporter_otlp_headers.
     "EXPORTER_OTLP_HEADERS": lambda: os.getenv("EXPORTER_OTLP_HEADERS"),
     # enable kv cache block scheduler v1 (no need for kv_cache_ratio)
-    "ENABLE_V1_KVCACHE_SCHEDULER": lambda: int(os.getenv("ENABLE_V1_KVCACHE_SCHEDULER", "0")),
+    "ENABLE_V1_KVCACHE_SCHEDULER": lambda: int(os.getenv("ENABLE_V1_KVCACHE_SCHEDULER", "1")),
     # set trace attribute job_id.
     "FD_JOB_ID": lambda: os.getenv("FD_JOB_ID"),
     # support max connections