diff --git a/core/src/main/java/com/taobao/arthas/core/command/monitor200/MonitorAdviceListener.java b/core/src/main/java/com/taobao/arthas/core/command/monitor200/MonitorAdviceListener.java
index 53ab5e5742f..fe01b212ebe 100644
--- a/core/src/main/java/com/taobao/arthas/core/command/monitor200/MonitorAdviceListener.java
+++ b/core/src/main/java/com/taobao/arthas/core/command/monitor200/MonitorAdviceListener.java
@@ -94,7 +94,7 @@ public synchronized void create() {
         if (timer == null) {
             timer = new Timer("Timer-for-arthas-monitor-" + process.session().getSessionId(), true);
             timer.scheduleAtFixedRate(new MonitorTimer(monitorData, process, command.getNumberOfLimit()),
-                    0, command.getCycle() * 1000);
+                    0, command.getCycle() * 1000L);
         }
     }
 
diff --git a/core/src/main/java/com/taobao/arthas/core/command/monitor200/ThreadSampler.java b/core/src/main/java/com/taobao/arthas/core/command/monitor200/ThreadSampler.java
index da414d00f06..91fade566d3 100644
--- a/core/src/main/java/com/taobao/arthas/core/command/monitor200/ThreadSampler.java
+++ b/core/src/main/java/com/taobao/arthas/core/command/monitor200/ThreadSampler.java
@@ -118,7 +118,7 @@ public int compare(ThreadVO o1, ThreadVO o2) {
         // Compute cpu usage
         final HashMap<ThreadVO, Double> cpuUsages = new HashMap<ThreadVO, Double>(threads.size());
         for (ThreadVO thread : threads) {
-            double cpu = sampleIntervalNanos == 0 ? 0 : (deltas.get(thread) * 10000 / sampleIntervalNanos / 100.0);
+            double cpu = sampleIntervalNanos == 0 ? 0 : (Math.rint(deltas.get(thread) * 10000.0 / sampleIntervalNanos) / 100.0);
             cpuUsages.put(thread, cpu);
         }