diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/cache/AbstractCache.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/cache/AbstractCache.java
index 8243b0360b..9659cd8191 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/cache/AbstractCache.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/cache/AbstractCache.java
@@ -180,6 +180,9 @@ public long tick() {
         long current = now();
         for (Iterator<CacheNode<K, V>> it = this.nodes(); it.hasNext();) {
             CacheNode<K, V> node = it.next();
+            LOG.info("expireTime: {}, current: {}, node.time(): {}, " +
+                     "current-node.time(): {}, node: {}",
+                     expireTime, current, node.time(), current - node.time(), node);
             if (current - node.time() > expireTime) {
                 // Remove item while iterating map (it must be ConcurrentMap)
                 this.remove(node.key());
@@ -188,7 +191,7 @@ public long tick() {
         }
 
         if (expireItems > 0) {
-            LOG.debug("Cache expired {} items cost {}ms (size {}, expire {}ms)",
+            LOG.info("Cache expired {} items cost {}ms (size {}, expire {}ms)",
                       expireItems, now() - current, this.size(), expireTime);
         }
         return expireItems;