diff --git a/changelog.md b/changelog.md
index eff83fc03..ca684ef0e 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,6 @@
 # 更新日志
 2.0(2020-04)
+- 下拉树系列添加下拉popup弹出前事件
 - 修复了复选下拉勾选值和搜索结果中含有父子串关系时提示不正确的问题
 - searcher提供可配是否支持搜索空格的allSearchBlank
 - 修复了复选下拉全选状态下使用空格添加值trigger显示更新不对的问题
diff --git a/src/base/tree/ztree/parttree.js b/src/base/tree/ztree/parttree.js
index b9770c0d4..771217108 100644
--- a/src/base/tree/ztree/parttree.js
+++ b/src/base/tree/ztree/parttree.js
@@ -42,7 +42,7 @@ BI.PartTree = BI.inherit(BI.AsyncTree, {
         var parentValues = BI.deepClone(treeNode.parentValues || self._getParentValues(treeNode));
         var name = this._getNodeValue(treeNode);
         if (treeNode.checked === true) {
-            this.options.paras.selectedValues = this._getJoinValue();
+            this.options.paras.selectedValues = this._getUnionValue();
             // this._buildTree(self.options.paras.selectedValues, BI.concat(parentValues, name));
             o.itemsCreator(BI.extend({}, o.paras, {
                 type: BI.TreeView.REQ_TYPE_ADJUST_DATA,
@@ -155,6 +155,41 @@ BI.PartTree = BI.inherit(BI.AsyncTree, {
         return BI.deepClone(this.options.paras.selectedValues || {});
     },
 
+    _getUnionValue: function () {
+        if (!this.nodes) {
+            return {};
+        }
+        var checkedValues = this._getSelectedValues();
+        if (BI.isEmpty(checkedValues)) {
+            return BI.deepClone(this.options.paras.selectedValues);
+        }
+        if (BI.isEmpty(this.options.paras.selectedValues)) {
+            return checkedValues;
+        }
+        return this._union(checkedValues, this.options.paras.selectedValues);
+    },
+
+    _union: function (valueA, valueB) {
+        var self = this;
+        var map = {};
+        track([], valueA, valueB);
+        track([], valueB, valueA);
+
+        function track (parent, node, compare) {
+            BI.each(node, function (n, item) {
+                if (BI.isNull(compare[n])) {
+                    self._addTreeNode(map, parent, n, item);
+                } else if (BI.isEmpty(compare[n])) {
+                    self._addTreeNode(map, parent, n, {});
+                } else {
+                    track(parent.concat([n]), node[n], compare[n]);
+                }
+            });
+        }
+
+        return map;
+    },
+
     // 生成树方法
     stroke: function (config) {
         var o = this.options;
diff --git a/src/component/treevaluechooser/combo.listtreevaluechooser.js b/src/component/treevaluechooser/combo.listtreevaluechooser.js
index af58a9394..076849dcb 100644
--- a/src/component/treevaluechooser/combo.listtreevaluechooser.js
+++ b/src/component/treevaluechooser/combo.listtreevaluechooser.js
@@ -65,6 +65,11 @@ BI.ListTreeValueChooserInsertCombo = BI.inherit(BI.AbstractListTreeValueChooser,
                 action: function () {
                     self.fireEvent(BI.ListTreeValueChooserInsertCombo.EVENT_CONFIRM);
                 }
+            }, {
+                eventName: BI.MultiTreeCombo.EVENT_BEFORE_POPUPVIEW,
+                action: function () {
+                    self.fireEvent(BI.TreeValueChooserInsertCombo.EVENT_BEFORE_POPUPVIEW);
+                }
             }]
         });
     },
@@ -89,4 +94,5 @@ BI.ListTreeValueChooserInsertCombo.EVENT_STOP = "EVENT_STOP";
 BI.ListTreeValueChooserInsertCombo.EVENT_CLICK_ITEM = "EVENT_CLICK_ITEM";
 BI.ListTreeValueChooserInsertCombo.EVENT_SEARCHING = "EVENT_SEARCHING";
 BI.ListTreeValueChooserInsertCombo.EVENT_CONFIRM = "EVENT_CONFIRM";
+BI.ListTreeValueChooserInsertCombo.EVENT_BEFORE_POPUPVIEW = "EVENT_BEFORE_POPUPVIEW";
 BI.shortcut("bi.list_tree_value_chooser_insert_combo", BI.ListTreeValueChooserInsertCombo);
\ No newline at end of file
diff --git a/src/component/treevaluechooser/combo.treevaluechooser.insert.js b/src/component/treevaluechooser/combo.treevaluechooser.insert.js
index 8a95f2e36..f89032c92 100644
--- a/src/component/treevaluechooser/combo.treevaluechooser.insert.js
+++ b/src/component/treevaluechooser/combo.treevaluechooser.insert.js
@@ -64,6 +64,11 @@ BI.TreeValueChooserInsertCombo = BI.inherit(BI.AbstractTreeValueChooser, {
                 action: function () {
                     self.fireEvent(BI.TreeValueChooserInsertCombo.EVENT_CONFIRM);
                 }
+            }, {
+                eventName: BI.MultiTreeCombo.EVENT_BEFORE_POPUPVIEW,
+                action: function () {
+                    self.fireEvent(BI.TreeValueChooserInsertCombo.EVENT_BEFORE_POPUPVIEW);
+                }
             }]
         });
     },
@@ -88,4 +93,5 @@ BI.TreeValueChooserInsertCombo.EVENT_STOP = "EVENT_STOP";
 BI.TreeValueChooserInsertCombo.EVENT_CLICK_ITEM = "EVENT_CLICK_ITEM";
 BI.TreeValueChooserInsertCombo.EVENT_SEARCHING = "EVENT_SEARCHING";
 BI.TreeValueChooserInsertCombo.EVENT_CONFIRM = "EVENT_CONFIRM";
+BI.TreeValueChooserInsertCombo.EVENT_BEFORE_POPUPVIEW = "EVENT_BEFORE_POPUPVIEW";
 BI.shortcut("bi.tree_value_chooser_insert_combo", BI.TreeValueChooserInsertCombo);
\ No newline at end of file
diff --git a/src/component/treevaluechooser/combo.treevaluechooser.js b/src/component/treevaluechooser/combo.treevaluechooser.js
index fbf813247..32e8fac3e 100644
--- a/src/component/treevaluechooser/combo.treevaluechooser.js
+++ b/src/component/treevaluechooser/combo.treevaluechooser.js
@@ -64,6 +64,11 @@ BI.TreeValueChooserCombo = BI.inherit(BI.AbstractTreeValueChooser, {
                 action: function () {
                     self.fireEvent(BI.TreeValueChooserCombo.EVENT_CONFIRM);
                 }
+            }, {
+                eventName: BI.MultiTreeCombo.EVENT_BEFORE_POPUPVIEW,
+                action: function () {
+                    self.fireEvent(BI.TreeValueChooserCombo.EVENT_BEFORE_POPUPVIEW);
+                }
             }]
         });
     },
@@ -82,6 +87,7 @@ BI.TreeValueChooserCombo = BI.inherit(BI.AbstractTreeValueChooser, {
     }
 });
 
+BI.TreeValueChooserCombo.EVENT_BEFORE_POPUPVIEW = "EVENT_BEFORE_POPUPVIEW";
 BI.TreeValueChooserCombo.EVENT_CONFIRM = "EVENT_CONFIRM";
 BI.TreeValueChooserCombo.EVENT_FOCUS = "EVENT_FOCUS";
 BI.TreeValueChooserCombo.EVENT_BLUR = "EVENT_BLUR";
diff --git a/src/widget/multilayerselecttree/multilayerselecttree.combo.js b/src/widget/multilayerselecttree/multilayerselecttree.combo.js
index f844cb2f1..fb6490468 100644
--- a/src/widget/multilayerselecttree/multilayerselecttree.combo.js
+++ b/src/widget/multilayerselecttree/multilayerselecttree.combo.js
@@ -96,7 +96,13 @@ BI.MultiLayerSelectTreeCombo = BI.inherit(BI.Widget, {
                 value: o.value,
                 maxHeight: 400,
                 minHeight: 240
-            }
+            },
+            listeners: [{
+                eventName: BI.Combo.EVENT_BEFORE_POPUPVIEW,
+                action: function () {
+                    self.fireEvent(BI.MultiLayerSelectTreeCombo.EVENT_BEFORE_POPUPVIEW);
+                }
+            }]
         };
     },
 
@@ -209,4 +215,5 @@ BI.MultiLayerSelectTreeCombo.EVENT_SEARCHING = "EVENT_SEARCHING";
 BI.MultiLayerSelectTreeCombo.EVENT_BLUR = "EVENT_BLUR";
 BI.MultiLayerSelectTreeCombo.EVENT_FOCUS = "EVENT_FOCUS";
 BI.MultiLayerSelectTreeCombo.EVENT_CHANGE = "EVENT_CHANGE";
+BI.MultiLayerSelectTreeCombo.EVENT_BEFORE_POPUPVIEW = "EVENT_BEFORE_POPUPVIEW";
 BI.shortcut("bi.multilayer_select_tree_combo", BI.MultiLayerSelectTreeCombo);
\ No newline at end of file
diff --git a/src/widget/multilayersingletree/multilayersingletree.combo.js b/src/widget/multilayersingletree/multilayersingletree.combo.js
index 319b9e5bf..7446ff5f5 100644
--- a/src/widget/multilayersingletree/multilayersingletree.combo.js
+++ b/src/widget/multilayersingletree/multilayersingletree.combo.js
@@ -99,7 +99,13 @@ BI.MultiLayerSingleTreeCombo = BI.inherit(BI.Widget, {
                 value: o.value,
                 maxHeight: 400,
                 minHeight: 240
-            }
+            },
+            listeners: [{
+                eventName: BI.Combo.EVENT_BEFORE_POPUPVIEW,
+                action: function () {
+                    self.fireEvent(BI.MultiLayerSingleTreeCombo.EVENT_BEFORE_POPUPVIEW);
+                }
+            }]
         };
     },
 
@@ -211,4 +217,5 @@ BI.MultiLayerSingleTreeCombo.EVENT_SEARCHING = "EVENT_SEARCHING";
 BI.MultiLayerSingleTreeCombo.EVENT_BLUR = "EVENT_BLUR";
 BI.MultiLayerSingleTreeCombo.EVENT_FOCUS = "EVENT_FOCUS";
 BI.MultiLayerSingleTreeCombo.EVENT_CHANGE = "EVENT_CHANGE";
+BI.MultiLayerSingleTreeCombo.EVENT_BEFORE_POPUPVIEW = "EVENT_BEFORE_POPUPVIEW";
 BI.shortcut("bi.multilayer_single_tree_combo", BI.MultiLayerSingleTreeCombo);
\ No newline at end of file
diff --git a/src/widget/multitree/multi.tree.combo.js b/src/widget/multitree/multi.tree.combo.js
index e12d4fa2a..e62da553c 100644
--- a/src/widget/multitree/multi.tree.combo.js
+++ b/src/widget/multitree/multi.tree.combo.js
@@ -195,7 +195,7 @@ BI.MultiTreeCombo = BI.inherit(BI.Single, {
             self.combo.setValue(self.storeValue);
             self.numberCounter.setValue(self.storeValue);
             self.populate();
-
+            self.fireEvent(BI.MultiTreeCombo.EVENT_BEFORE_POPUPVIEW);
         });
         this.combo.on(BI.Combo.EVENT_BEFORE_HIDEVIEW, function () {
             if (isSearching()) {
@@ -333,5 +333,6 @@ BI.MultiTreeCombo.EVENT_STOP = "EVENT_STOP";
 BI.MultiTreeCombo.EVENT_SEARCHING = "EVENT_SEARCHING";
 BI.MultiTreeCombo.EVENT_CLICK_ITEM = "EVENT_CLICK_ITEM";
 BI.MultiTreeCombo.EVENT_CONFIRM = "EVENT_CONFIRM";
+BI.MultiTreeCombo.EVENT_BEFORE_POPUPVIEW = "EVENT_BEFORE_POPUPVIEW";
 
 BI.shortcut("bi.multi_tree_combo", BI.MultiTreeCombo);
\ No newline at end of file
diff --git a/src/widget/multitree/multi.tree.insert.combo.js b/src/widget/multitree/multi.tree.insert.combo.js
index 77f4c9636..e005b8097 100644
--- a/src/widget/multitree/multi.tree.insert.combo.js
+++ b/src/widget/multitree/multi.tree.insert.combo.js
@@ -205,7 +205,7 @@ BI.MultiTreeInsertCombo = BI.inherit(BI.Single, {
             self.combo.setValue(self.storeValue);
             self.numberCounter.setValue(self.storeValue);
             self.populate();
-
+            self.fireEvent(BI.MultiTreeInsertCombo.EVENT_BEFORE_POPUPVIEW);
         });
         this.combo.on(BI.Combo.EVENT_BEFORE_HIDEVIEW, function () {
             if (isSearching()) {
@@ -348,5 +348,6 @@ BI.MultiTreeInsertCombo.EVENT_STOP = "EVENT_STOP";
 BI.MultiTreeInsertCombo.EVENT_CLICK_ITEM = "EVENT_CLICK_ITEM";
 BI.MultiTreeInsertCombo.EVENT_SEARCHING = "EVENT_SEARCHING";
 BI.MultiTreeInsertCombo.EVENT_CONFIRM = "EVENT_CONFIRM";
+BI.MultiTreeInsertCombo.EVENT_BEFORE_POPUPVIEW = "EVENT_BEFORE_POPUPVIEW";
 
 BI.shortcut("bi.multi_tree_insert_combo", BI.MultiTreeInsertCombo);
\ No newline at end of file
diff --git a/src/widget/multitree/multi.tree.list.combo.js b/src/widget/multitree/multi.tree.list.combo.js
index 6750b8192..31fb9893d 100644
--- a/src/widget/multitree/multi.tree.list.combo.js
+++ b/src/widget/multitree/multi.tree.list.combo.js
@@ -224,7 +224,7 @@ BI.MultiTreeListCombo = BI.inherit(BI.Single, {
             self.combo.setValue(self.storeValue);
             self.numberCounter.setValue(self.storeValue);
             self.populate();
-
+            self.fireEvent(BI.MultiTreeListCombo.EVENT_BEFORE_POPUPVIEW);
         });
         this.combo.on(BI.Combo.EVENT_BEFORE_HIDEVIEW, function () {
             if (isSearching()) {
@@ -372,5 +372,6 @@ BI.MultiTreeListCombo.EVENT_STOP = "EVENT_STOP";
 BI.MultiTreeListCombo.EVENT_CLICK_ITEM = "EVENT_CLICK_ITEM";
 BI.MultiTreeListCombo.EVENT_SEARCHING = "EVENT_SEARCHING";
 BI.MultiTreeListCombo.EVENT_CONFIRM = "EVENT_CONFIRM";
+BI.MultiTreeListCombo.EVENT_BEFORE_POPUPVIEW = "EVENT_BEFORE_POPUPVIEW";
 
 BI.shortcut("bi.multi_tree_list_combo", BI.MultiTreeListCombo);
\ No newline at end of file