diff --git a/src/main/java/com/aliyun/openservices/log/common/Consts.java b/src/main/java/com/aliyun/openservices/log/common/Consts.java
index 4c51ae71..0b635b7e 100755
--- a/src/main/java/com/aliyun/openservices/log/common/Consts.java
+++ b/src/main/java/com/aliyun/openservices/log/common/Consts.java
@@ -103,6 +103,7 @@ public String toString() {
     public static final String CONST_X_SLS_CURSOR = "x-log-cursor";
     public static final String CONST_X_SLS_COUNT = "x-log-count";
     public static final String CONST_X_SLS_PROCESS = "x-log-progress";
+    public static final String CONST_X_SLS_SCANBYTES = "x-log-scanbytes";
     public static final String CONST_X_SLS_NEXT_TOKEN = "x-log-nexttoken";
     public static final String CONST_X_ACS_SECURITY_TOKEN = "x-acs-security-token";
     public static final String CONST_X_LOG_RESOURCEOWNERACCOUNT = "x-log-resourceowneraccount";
diff --git a/src/main/java/com/aliyun/openservices/log/request/GetHistogramsRequest.java b/src/main/java/com/aliyun/openservices/log/request/GetHistogramsRequest.java
index 78f90738..a5190698 100755
--- a/src/main/java/com/aliyun/openservices/log/request/GetHistogramsRequest.java
+++ b/src/main/java/com/aliyun/openservices/log/request/GetHistogramsRequest.java
@@ -70,6 +70,33 @@ public GetHistogramsRequest(String project, String logStore, String topic,
 		SetAccurate(accurate);
 	}
 
+	/**
+	 * Construct a request
+	 *
+	 * @param project
+	 *            sls project
+	 * @param logStore
+	 *            the logstore in the project
+	 * @param topic
+	 *            the topic of the logstore
+	 * @param query
+	 *            user defined query
+	 * @param from
+	 *            the begin time
+	 * @param to
+	 *            the end time
+	 * @param accurate
+	 * 			  accurate flag
+	 * @param reverse
+	 *            reverse flag
+	 */
+	public GetHistogramsRequest(String project, String logStore, String topic,
+								String query, int from, int to, boolean accurate, boolean reverse) {
+		this(project, logStore, topic, query, from, to);
+		SetAccurate(accurate);
+		SetReverse(reverse);
+	}
+
 	/**
 	 * Set log store
 	 * 
@@ -194,4 +221,28 @@ public boolean GetAccurate() {
 		}
 	}
 
+	/**
+	 * Set request reverse flag
+	 *
+	 * @param reverse
+	 *            reverse flag
+	 */
+	public void SetReverse(boolean reverse) {
+		SetParam(Consts.CONST_REVERSE, String.valueOf(reverse));
+	}
+
+	/**
+	 * Get request reverse flag
+	 *
+	 * @return reverse flag
+	 */
+	public boolean GetReverse() {
+		String reverse = GetParam(Consts.CONST_REVERSE);
+		if (reverse.isEmpty()) {
+			return false;
+		} else {
+			return Boolean.parseBoolean(reverse);
+		}
+	}
+
 }
diff --git a/src/main/java/com/aliyun/openservices/log/response/GetHistogramsResponse.java b/src/main/java/com/aliyun/openservices/log/response/GetHistogramsResponse.java
index b3e6fbf7..1acf0c31 100755
--- a/src/main/java/com/aliyun/openservices/log/response/GetHistogramsResponse.java
+++ b/src/main/java/com/aliyun/openservices/log/response/GetHistogramsResponse.java
@@ -23,6 +23,7 @@ public class GetHistogramsResponse extends Response {
     private static final long serialVersionUID = 5169979404935069850L;
     private boolean mIsCompleted = false;
     private long mCount = 0;
+    private long mScanBytes = 0;
     private ArrayList<Histogram> mHistogram = new ArrayList<Histogram>();
 
     /**
@@ -33,6 +34,9 @@ public class GetHistogramsResponse extends Response {
     public GetHistogramsResponse(Map<String, String> headers) {
         super(headers);
         this.SetProcessStatus(headers.get(Consts.CONST_X_SLS_PROCESS));
+        if (headers.containsKey(Consts.CONST_X_SLS_SCANBYTES)) {
+            mScanBytes = Long.parseLong(headers.get(Consts.CONST_X_SLS_SCANBYTES));
+        }
     }
 
     /**
@@ -44,6 +48,15 @@ public long GetTotalCount() {
         return mCount;
     }
 
+    /**
+     * Get query scan bytes
+     *
+     * @return scan bytes
+     */
+    public long GetScanBytes() {
+        return mScanBytes;
+    }
+
     /**
      * Set process status to the response
      *