diff --git a/src/main/java/cn/langpy/kotime/config/DefaultConfig.java b/src/main/java/cn/langpy/kotime/config/DefaultConfig.java
index 2ce8286..7fb6519 100644
--- a/src/main/java/cn/langpy/kotime/config/DefaultConfig.java
+++ b/src/main/java/cn/langpy/kotime/config/DefaultConfig.java
@@ -16,6 +16,7 @@ public class DefaultConfig {
     private String logLanguage;
     private Boolean logEnable;
     private Double threshold;
+    private Double discardRate;
     private String pointcut;
     private Boolean exceptionEnable;
     private Boolean paramAnalyse;
@@ -30,6 +31,14 @@ public class DefaultConfig {
     private String userName;
     private String password;
 
+    public Double getDiscardRate() {
+        return discardRate;
+    }
+
+    public void setDiscardRate(Double discardRate) {
+        this.discardRate = discardRate;
+    }
+
     public Boolean getDataReset() {
         return dataReset;
     }
diff --git a/src/main/java/cn/langpy/kotime/config/LoadConfig.java b/src/main/java/cn/langpy/kotime/config/LoadConfig.java
index efa1116..219d686 100644
--- a/src/main/java/cn/langpy/kotime/config/LoadConfig.java
+++ b/src/main/java/cn/langpy/kotime/config/LoadConfig.java
@@ -74,6 +74,7 @@ public class LoadConfig {
         config.setContextPath(defaultConfig.getContextPath());
         config.setLanguage(defaultConfig.getLanguage() == null ? "chinese" : defaultConfig.getLanguage());
         config.setThreadNum(defaultConfig.getThreadNum() == null ? 2 : defaultConfig.getThreadNum());
+        config.setDiscardRate(defaultConfig.getDiscardRate() == null ? 0.3 : defaultConfig.getDiscardRate());
         config.setAuthEnable(defaultConfig.getAuthEnable() == null ? false : defaultConfig.getAuthEnable());
         config.setParamAnalyse(defaultConfig.getParamAnalyse() == null ? true : defaultConfig.getParamAnalyse());
         config.setDataReset(defaultConfig.getDataReset() == null ? false : defaultConfig.getDataReset());
diff --git a/src/main/java/cn/langpy/kotime/data/DataBase.java b/src/main/java/cn/langpy/kotime/data/DataBase.java
index 509a14e..070e116 100644
--- a/src/main/java/cn/langpy/kotime/data/DataBase.java
+++ b/src/main/java/cn/langpy/kotime/data/DataBase.java
@@ -150,6 +150,9 @@ public class DataBase implements GraphService {
         try {
             List<Map<String, Object>> query = DataBaseUtil.query(getWriteConnection(), KoSqlConstant.queryMethodRe, new Object[]{sourceMethodNode.getId() + targetMethodNode.getId()});
             if (query.size() > 0) {
+                if (Math.random()<Context.getConfig().getDiscardRate()) {
+                    return null;
+                }
                 Map<String, Object> old = query.get(0);
                 double oldAvg = (double)old.get("avg_run_time");
                 double oldMax = (double)old.get("max_run_time");
@@ -215,6 +218,9 @@ public class DataBase implements GraphService {
             };
             DataBaseUtil.insert(getWriteConnection(), KoSqlConstant.addParamsAna, params);
         } else {
+            if (Math.random()<Context.getConfig().getDiscardRate()) {
+                return;
+            }
             Map<String, Object> old = query.get(0);
             double oldAvg = (double)old.get("avg_run_time");
             double oldMax = (double)old.get("max_run_time");
diff --git a/src/main/java/cn/langpy/kotime/data/MemoryBase.java b/src/main/java/cn/langpy/kotime/data/MemoryBase.java
index 01d9779..9c1c698 100644
--- a/src/main/java/cn/langpy/kotime/data/MemoryBase.java
+++ b/src/main/java/cn/langpy/kotime/data/MemoryBase.java
@@ -64,6 +64,9 @@ public class MemoryBase implements GraphService {
         if (paramValueMetricMap.containsKey(methodId)) {
             Map<String, ParamMetric> paramMetricMap = paramValueMetricMap.get(methodId);
             if (paramMetricMap.containsKey(paramsKey)) {
+                if (Math.random()<Context.getConfig().getDiscardRate()) {
+                    return;
+                }
                 ParamMetric paramMetric = paramMetricMap.get(paramsKey);
                 BigDecimal bg = BigDecimal.valueOf((paramMetric.getAvgRunTime() + v) / 2.0);
                 double avg = bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
@@ -117,6 +120,9 @@ public class MemoryBase implements GraphService {
             methodRelations.put(methodRelation.getId(), methodRelation);
             return methodRelation;
         } else {
+            if (Math.random()<Context.getConfig().getDiscardRate()) {
+                return null;
+            }
             BigDecimal bg = BigDecimal.valueOf((methodRelation.getAvgRunTime() + old.getAvgRunTime()) / 2.0);
             double avg = bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
             old.setAvgRunTime(avg);
diff --git a/src/main/java/cn/langpy/kotime/data/RedisBase.java b/src/main/java/cn/langpy/kotime/data/RedisBase.java
index d58f90b..8b4d495 100644
--- a/src/main/java/cn/langpy/kotime/data/RedisBase.java
+++ b/src/main/java/cn/langpy/kotime/data/RedisBase.java
@@ -66,6 +66,9 @@ public class RedisBase implements GraphService {
         if (redisTemplate.hasKey(key)) {
             Map<String, JSONObject> paramMetricMap = query(key, Map.class);
             if (paramMetricMap.containsKey(paramsKey)) {
+                if (Math.random()<Context.getConfig().getDiscardRate()) {
+                    return;
+                }
                 ParamMetric paramMetric = paramMetricMap.get(paramsKey).toJavaObject(ParamMetric.class);
                 BigDecimal bg = BigDecimal.valueOf((paramMetric.getAvgRunTime() + v) / 2.0);
                 double avg = bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
@@ -122,6 +125,9 @@ public class RedisBase implements GraphService {
             insert(key, methodRelation);
             return methodRelation;
         } else {
+            if (Math.random()<Context.getConfig().getDiscardRate()) {
+                return null;
+            }
             BigDecimal bg = BigDecimal.valueOf((methodRelation.getAvgRunTime() + old.getAvgRunTime()) / 2.0);
             double avg = bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
             old.setAvgRunTime(avg);
diff --git a/src/main/resources/META-INF/spring-configuration-metadata.json b/src/main/resources/META-INF/spring-configuration-metadata.json
index 2354252..ba9b9b8 100644
--- a/src/main/resources/META-INF/spring-configuration-metadata.json
+++ b/src/main/resources/META-INF/spring-configuration-metadata.json
@@ -109,6 +109,13 @@
       "description": "red will appear if avgRunTime>threshold",
       "sourceType": "cn.langpy.kotime.config.DefaultConfig"
     },
+    {
+      "name": "ko-time.discardRate",
+      "type": "java.lang.Double",
+      "defaultValue": 0.3,
+      "description": "data will be discard if Math.random()<discardRate",
+      "sourceType": "cn.langpy.kotime.config.DefaultConfig"
+    },
     {
       "name": "ko-time.auth-enable",
       "type": "java.lang.Boolean",