diff --git a/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterMetric.java b/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterMetric.java
index eea3c459..1dbdae21 100644
--- a/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterMetric.java
+++ b/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterMetric.java
@@ -33,8 +33,7 @@ public class ClusterMetric {
         AssertUtil.isTrue(sampleCount > 0, "sampleCount should be positive");
         AssertUtil.isTrue(intervalInMs > 0, "interval should be positive");
         AssertUtil.isTrue(intervalInMs % sampleCount == 0, "time span needs to be evenly divided");
-        int windowLengthInMs = intervalInMs / sampleCount;
-        this.metric = new ClusterMetricLeapArray(windowLengthInMs, intervalInMs);
+        this.metric = new ClusterMetricLeapArray(sampleCount, intervalInMs);
     }
 
     public void add(ClusterFlowEvent event, long count) {
diff --git a/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterMetricLeapArray.java b/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterMetricLeapArray.java
index 40d2d752..da76b032 100644
--- a/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterMetricLeapArray.java
+++ b/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterMetricLeapArray.java
@@ -30,14 +30,8 @@ public class ClusterMetricLeapArray extends LeapArray<ClusterMetricBucket> {
     private final LongAdder[] occupyCounter;
     private boolean hasOccupied = false;
 
-    /**
-     * The total bucket count is: {@link #sampleCount} = intervalInMs / windowLengthInMs.
-     *
-     * @param windowLengthInMs a single window bucket's time length in milliseconds.
-     * @param intervalInMs    the total time span of this {@link LeapArray} in milliseconds.
-     */
-    public ClusterMetricLeapArray(int windowLengthInMs, int intervalInMs) {
-        super(windowLengthInMs, intervalInMs / 1000);
+    public ClusterMetricLeapArray(int sampleCount, int intervalInMs) {
+        super(sampleCount, intervalInMs);
         ClusterFlowEvent[] events = ClusterFlowEvent.values();
         this.occupyCounter = new LongAdder[events.length];
         for (ClusterFlowEvent event : events) {
diff --git a/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterParamMetric.java b/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterParamMetric.java
index 4daf7e41..1768d8ea 100644
--- a/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterParamMetric.java
+++ b/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterParamMetric.java
@@ -39,8 +39,7 @@ public class ClusterParamMetric {
         AssertUtil.isTrue(sampleCount > 0, "sampleCount should be positive");
         AssertUtil.isTrue(intervalInMs > 0, "interval should be positive");
         AssertUtil.isTrue(intervalInMs % sampleCount == 0, "time span needs to be evenly divided");
-        int windowLengthInMs = intervalInMs / sampleCount;
-        this.metric = new ClusterParameterLeapArray<>(windowLengthInMs, intervalInMs, maxCapacity);
+        this.metric = new ClusterParameterLeapArray<>(sampleCount, intervalInMs, maxCapacity);
     }
 
     public long getSum(Object value) {
diff --git a/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterParameterLeapArray.java b/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterParameterLeapArray.java
index dbb603b4..138baa64 100644
--- a/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterParameterLeapArray.java
+++ b/sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/flow/statistic/metric/ClusterParameterLeapArray.java
@@ -30,8 +30,8 @@ public class ClusterParameterLeapArray<C> extends LeapArray<CacheMap<Object, C>>
 
     private final int maxCapacity;
 
-    public ClusterParameterLeapArray(int windowLengthInMs, int intervalInMs, int maxCapacity) {
-        super(windowLengthInMs, intervalInMs / 1000);
+    public ClusterParameterLeapArray(int sampleCount, int intervalInMs, int maxCapacity) {
+        super(sampleCount, intervalInMs);
         AssertUtil.isTrue(maxCapacity > 0, "maxCapacity of LRU map should be positive");
         this.maxCapacity = maxCapacity;
     }