diff --git a/das/src/main/java/com/das/modules/node/command/HeartbeatCommand.java b/das/src/main/java/com/das/modules/node/command/HeartbeatCommand.java
index 59281e29..6487f3a2 100644
--- a/das/src/main/java/com/das/modules/node/command/HeartbeatCommand.java
+++ b/das/src/main/java/com/das/modules/node/command/HeartbeatCommand.java
@@ -34,7 +34,7 @@ public class HeartbeatCommand implements BaseCommand{
                 for (JsonNode linkNode : links) {
                     String linkId = linkNode.get("linkId").asText();
                     boolean online = linkNode.get("online").asBoolean();
-                    String key = String.format("link:%d:online", linkId, online);
+                    String key = String.format("link:%s:online", linkId);
                     adminRedisTemplate.set(key, online ? 1 : 0);
                     adminRedisTemplate.expire(key, HEARTBEAT_TTL);
                 }