diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 3ffb7d5..ed7ec1f 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -3,7 +3,6 @@
   <component name="ChangeListManager">
     <list default="true" id="be5bf74e-ad1c-4197-8a1f-ac93566d8aa7" name="Default" comment="init">
       <change type="MODIFICATION" beforePath="$PROJECT_DIR$/README.md" afterPath="$PROJECT_DIR$/README.md" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/机器学习/集成学习/GBDT.md" afterPath="$PROJECT_DIR$/机器学习/集成学习/GBDT.md" />
       <change type="MODIFICATION" beforePath="$PROJECT_DIR$/机器学习/集成学习/Xgboost.md" afterPath="$PROJECT_DIR$/机器学习/集成学习/Xgboost.md" />
     </list>
     <ignored path="Reflection_Summary.iws" />
@@ -38,8 +37,8 @@
           </provider>
           <provider selected="true" editor-type-id="split-provider[text-editor;MarkdownPreviewEditor]">
             <state split_layout="SPLIT">
-              <first_editor relative-caret-position="385">
-                <caret line="243" column="26" selection-start-line="243" selection-start-column="26" selection-end-line="243" selection-end-column="26" />
+              <first_editor relative-caret-position="400">
+                <caret line="244" column="19" selection-start-line="244" selection-start-column="19" selection-end-line="244" selection-end-column="19" />
                 <folding />
               </first_editor>
               <second_editor>
@@ -77,8 +76,8 @@
         <entry file="file://$PROJECT_DIR$/机器学习/集成学习/Xgboost.md">
           <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
             <state split_layout="SPLIT">
-              <first_editor relative-caret-position="430">
-                <caret line="72" column="21" selection-start-line="72" selection-start-column="2" selection-end-line="72" selection-end-column="21" />
+              <first_editor relative-caret-position="520">
+                <caret line="80" column="14" selection-start-line="80" selection-start-column="2" selection-end-line="80" selection-end-column="14" />
                 <folding />
               </first_editor>
               <second_editor />
@@ -228,48 +227,6 @@
               <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.ProjectViewProjectNode" />
             </PATH_ELEMENT>
           </PATH>
-          <PATH>
-            <PATH_ELEMENT>
-              <option name="myItemId" value="Reflection_Summary" />
-              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.ProjectViewProjectNode" />
-            </PATH_ELEMENT>
-            <PATH_ELEMENT>
-              <option name="myItemId" value="Reflection_Summary" />
-              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode" />
-            </PATH_ELEMENT>
-          </PATH>
-          <PATH>
-            <PATH_ELEMENT>
-              <option name="myItemId" value="Reflection_Summary" />
-              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.ProjectViewProjectNode" />
-            </PATH_ELEMENT>
-            <PATH_ELEMENT>
-              <option name="myItemId" value="Reflection_Summary" />
-              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode" />
-            </PATH_ELEMENT>
-            <PATH_ELEMENT>
-              <option name="myItemId" value="机器学习" />
-              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode" />
-            </PATH_ELEMENT>
-            <PATH_ELEMENT>
-              <option name="myItemId" value="集成学习" />
-              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode" />
-            </PATH_ELEMENT>
-          </PATH>
-          <PATH>
-            <PATH_ELEMENT>
-              <option name="myItemId" value="Reflection_Summary" />
-              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.ProjectViewProjectNode" />
-            </PATH_ELEMENT>
-            <PATH_ELEMENT>
-              <option name="myItemId" value="Reflection_Summary" />
-              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode" />
-            </PATH_ELEMENT>
-            <PATH_ELEMENT>
-              <option name="myItemId" value="机器学习" />
-              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode" />
-            </PATH_ELEMENT>
-          </PATH>
         </subPane>
       </pane>
     </panes>
@@ -553,9 +510,9 @@
   </component>
   <component name="ToolWindowManager">
     <frame x="0" y="23" width="1440" height="823" extended-state="0" />
-    <editor active="true" />
+    <editor active="false" />
     <layout>
-      <window_info id="Project" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.23462088" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
+      <window_info id="Project" active="true" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.23462088" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
       <window_info id="TODO" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="6" side_tool="false" content_ui="tabs" />
       <window_info id="Event Log" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="7" side_tool="true" content_ui="tabs" />
       <window_info id="Database" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
@@ -1411,11 +1368,11 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/机器学习/集成学习/Xgboost.md">
+    <entry file="file://$PROJECT_DIR$/机器学习/集成学习/GBDT.md">
       <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
         <state split_layout="SPLIT">
-          <first_editor relative-caret-position="430">
-            <caret line="72" column="21" selection-start-line="72" selection-start-column="2" selection-end-line="72" selection-end-column="21" />
+          <first_editor relative-caret-position="520">
+            <caret line="109" column="0" selection-start-line="109" selection-start-column="0" selection-end-line="109" selection-end-column="0" />
             <folding />
           </first_editor>
           <second_editor />
@@ -1433,11 +1390,11 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/机器学习/集成学习/GBDT.md">
+    <entry file="file://$PROJECT_DIR$/机器学习/集成学习/Xgboost.md">
       <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
         <state split_layout="SPLIT">
           <first_editor relative-caret-position="520">
-            <caret line="109" column="0" selection-start-line="109" selection-start-column="0" selection-end-line="109" selection-end-column="0" />
+            <caret line="80" column="14" selection-start-line="80" selection-start-column="2" selection-end-line="80" selection-end-column="14" />
             <folding />
           </first_editor>
           <second_editor />
@@ -1467,8 +1424,8 @@
       </provider>
       <provider selected="true" editor-type-id="split-provider[text-editor;MarkdownPreviewEditor]">
         <state split_layout="SPLIT">
-          <first_editor relative-caret-position="385">
-            <caret line="243" column="26" selection-start-line="243" selection-start-column="26" selection-end-line="243" selection-end-column="26" />
+          <first_editor relative-caret-position="400">
+            <caret line="244" column="19" selection-start-line="244" selection-start-column="19" selection-end-line="244" selection-end-column="19" />
             <folding />
           </first_editor>
           <second_editor>
diff --git a/README.md b/README.md
index 3a9452b..5872d52 100644
--- a/README.md
+++ b/README.md
@@ -242,6 +242,7 @@
     - [xgboost特征重要性是如何得到的](机器学习/集成学习/Xgboost.md#L164)
     - [XGBoost中如何对树进行剪枝](机器学习/集成学习/Xgboost.md#L164)
     - [XGBoost模型如果过拟合了怎么解决](机器学习/集成学习/Xgboost.md#L164)
+    - [xgboost如何调参数](机器学习/集成学习/Xgboost.md#L164)
 - FM/FFM
 - SVM
     - [简单介绍SVM](机器学习/支持向量机/支持向量机.md#L164)
diff --git "a/\346\234\272\345\231\250\345\255\246\344\271\240/\351\233\206\346\210\220\345\255\246\344\271\240/Xgboost.md" "b/\346\234\272\345\231\250\345\255\246\344\271\240/\351\233\206\346\210\220\345\255\246\344\271\240/Xgboost.md"
index d1891ca..6c96357 100644
--- "a/\346\234\272\345\231\250\345\255\246\344\271\240/\351\233\206\346\210\220\345\255\246\344\271\240/Xgboost.md"
+++ "b/\346\234\272\345\231\250\345\255\246\344\271\240/\351\233\206\346\210\220\345\255\246\344\271\240/Xgboost.md"
@@ -76,4 +76,10 @@ MAPE:![](https://tva1.sinaimg.cn/large/006y8mN6gy1g94mx7uyuej303f0170sj.jpg)
     - 增大叶子结点的权重
     - 增大惩罚系数
 - subsample的力度变大，降低异常点的影响
-- 减小learning rate，提高estimator
\ No newline at end of file
+- 减小learning rate，提高estimator
+
+# xgboost如何调参数？
+- 先确定learningrate和estimator
+- 再确定每棵树的基本信息，max_depth和 min_child_weight
+- 再确定全局信息：比如最小分裂增益，子采样参数，正则参数
+- 重新降低learningrate，得到最优解
\ No newline at end of file