diff --git a/src/main/java/org/wlld/regressionForest/Forest.java b/src/main/java/org/wlld/regressionForest/Forest.java
index 4158865..f3f12b4 100644
--- a/src/main/java/org/wlld/regressionForest/Forest.java
+++ b/src/main/java/org/wlld/regressionForest/Forest.java
@@ -34,15 +34,17 @@ public class Forest extends Frequency {
     private int id;//本节点的id
     private boolean isRemove = false;//是否已经被移除了
     private boolean notRemovable = false;//不可移除
+    private int minGrain;//最小粒度
 
     public Forest(int featureSize, double shrinkParameter, Matrix pc, Map<Integer, Forest> forestMap
-            , int id) {
+            , int id, int minGrain) {
         this.featureSize = featureSize;
         this.shrinkParameter = shrinkParameter;
         this.pc = pc;
         w = new double[featureSize];
         this.forestMap = forestMap;
         this.id = id;
+        this.minGrain = minGrain;
     }
 
     public double getMedian() {
@@ -186,7 +188,7 @@ public class Forest extends Frequency {
 
     public void cut() throws Exception {
         int y = resultMatrix.getX();
-        if (y > 200) {
+        if (y > minGrain) {
             double[] dm = findG();
             int z = y / 2;
             median = dm[z];
@@ -203,8 +205,8 @@ public class Forest extends Frequency {
             int rightId = leftId + 1;
             //System.out.println("id:" + id + ",size:" + dm.length);
             forestMap.put(id, this);
-            forestLeft = new Forest(featureSize, shrinkParameter, pc, forestMap, leftId);
-            forestRight = new Forest(featureSize, shrinkParameter, pc, forestMap, rightId);
+            forestLeft = new Forest(featureSize, shrinkParameter, pc, forestMap, leftId, minGrain);
+            forestRight = new Forest(featureSize, shrinkParameter, pc, forestMap, rightId, minGrain);
             forestRight.setFather(this);
             forestLeft.setFather(this);
             Matrix conditionMatrixLeft = new Matrix(leftNub, featureSize);//条件矩阵左
diff --git a/src/main/java/org/wlld/regressionForest/RegressionForest.java b/src/main/java/org/wlld/regressionForest/RegressionForest.java
index 5d1ab13..95b8ba3 100644
--- a/src/main/java/org/wlld/regressionForest/RegressionForest.java
+++ b/src/main/java/org/wlld/regressionForest/RegressionForest.java
@@ -34,7 +34,7 @@ public class RegressionForest extends Frequency {
         this.cosSize = cosSize;
     }
 
-    public RegressionForest(int size, int featureNub, double shrinkParameter) throws Exception {//初始化
+    public RegressionForest(int size, int featureNub, double shrinkParameter, int minGrain) throws Exception {//初始化
         if (size > 0 && featureNub > 0) {
             this.featureNub = featureNub;
             w = new double[featureNub];
@@ -42,7 +42,7 @@ public class RegressionForest extends Frequency {
             conditionMatrix = new Matrix(size, featureNub);
             resultMatrix = new Matrix(size, 1);
             createG();
-            forest = new Forest(featureNub, shrinkParameter, pc, forestMap, 1);
+            forest = new Forest(featureNub, shrinkParameter, pc, forestMap, 1, minGrain);
             forestMap.put(1, forest);
             forest.setW(w);
             forest.setConditionMatrix(conditionMatrix);
diff --git a/src/test/java/coverTest/ForestTest.java b/src/test/java/coverTest/ForestTest.java
index adcc746..e3dacd5 100644
--- a/src/test/java/coverTest/ForestTest.java
+++ b/src/test/java/coverTest/ForestTest.java
@@ -22,7 +22,7 @@ public class ForestTest {
 
     public static void test() throws Exception {//对分段回归进行测试
         int size = 2000;
-        RegressionForest regressionForest = new RegressionForest(size, 3, 0.01);
+        RegressionForest regressionForest = new RegressionForest(size, 3, 0.01, 200);
         regressionForest.setCosSize(40);
         List<double[]> a = fun(0.1, 0.2, 0.3, size, 2, 1);
         List<double[]> b = fun(0.7, 0.3, 0.1, size, 2, 2);