diff --git a/library/src/main/java/com/qiniu/android/collect/ReportConfig.java b/library/src/main/java/com/qiniu/android/collect/ReportConfig.java
index 61b66459..b3506443 100644
--- a/library/src/main/java/com/qiniu/android/collect/ReportConfig.java
+++ b/library/src/main/java/com/qiniu/android/collect/ReportConfig.java
@@ -24,7 +24,7 @@ public class ReportConfig {
     public long uploadThreshold;
 
     /**
-     * 记录文件最大值  要大于 uploadThreshold  单位：字节  默认为20 * 1024 * 1024
+     * 记录文件最大值  要大于 uploadThreshold  单位：字节  默认为4 * 1024 * 1024
      */
     public long maxRecordFileSize;
 
diff --git a/library/src/main/java/com/qiniu/android/common/Config.java b/library/src/main/java/com/qiniu/android/common/Config.java
index dd3c48c4..c75a5780 100644
--- a/library/src/main/java/com/qiniu/android/common/Config.java
+++ b/library/src/main/java/com/qiniu/android/common/Config.java
@@ -56,7 +56,7 @@ public final class Config {
      * <p>
      * 记录文件大于此值后暂停记录上传信息。
      */
-    public static int maxRecordFileSize = 20 * 1024 * 1024;
+    public static int maxRecordFileSize = 4 * 1024 * 1024;
 
     /**
      * 记录文件大于 uploadThreshold 后才可能触发上传，单位：字节。