diff --git a/chart_plugin/src/st_space_display.cpp b/chart_plugin/src/st_space_display.cpp
index e3267bfde4d48ce6d9778943881f14c7818e8af6..49082c9e5a3eb88d3878eafea7a64deea5f9d27f 100755
--- a/chart_plugin/src/st_space_display.cpp
+++ b/chart_plugin/src/st_space_display.cpp
@@ -71,7 +71,6 @@ const qreal CURVE_SYMBOL_PEN_WIDTH = 0x01;
 const int32_t CURVE_SYMBOL_SIZE_WIDTH = 0x02;
 const int32_t CURVE_SYMBOL_SIZE_HRIGHT = 0x02;
 
-const int32_t LEGEND_WIDGETS_SIZE = 0x01;
 const QString LEGEND_STYLE_SHEET = "color: rgb(255, 255, 255);";
 
 const QString QWTPLOT_TITLE_FONT_FAMILY = "楷体";
@@ -313,8 +312,8 @@ void StSpaceDisplay::ShowCurve(QwtPlotItem *item, bool isVisible)
     item->setVisible(isVisible);
     QwtLegend *legend = qobject_cast<QwtLegend *>(ui.qwtPlot->legend());
     QList<QWidget *> legendWidgets = legend->legendWidgets(ui.qwtPlot->itemToInfo(item));
-    if (legendWidgets.size() == LEGEND_WIDGETS_SIZE) {
-        QwtLegendLabel *legendLabel = qobject_cast<QwtLegendLabel *>(legendWidgets[0]);
+    for (int32_t i = 0; i < legendWidgets.size(); i++) {
+        QwtLegendLabel *legendLabel = qobject_cast<QwtLegendLabel *>(legendWidgets.at(i));
         if (legendLabel != nullptr) {
             legendLabel->setChecked(isVisible);
         }
@@ -697,9 +696,20 @@ void StSpaceDisplay::ShowObjects(const QMap<QString, QPolygonF> &stObjectsMap)
 {
     auto objectsTypeId = stSpaceData.GetObjectsTypeIdMap();
 
-    if (!stObjectsCurveMap.empty()) {
-        stObjectsCurveMap.clear();
+    for (auto iter = stObjectsCurveMap.begin(); iter != stObjectsCurveMap.end(); iter++) {
+        QwtLegend *legend = qobject_cast<QwtLegend *>(ui.qwtPlot->legend());
+        QList<QWidget *> legendWidgets = legend->legendWidgets(ui.qwtPlot->itemToInfo(iter->second.get()));
+        for (int32_t i = 0; i < legendWidgets.size(); i++) {
+            QwtLegendLabel *legendLabel = qobject_cast<QwtLegendLabel *>(legendWidgets.at(i));
+            if (legendLabel != nullptr) {
+                delete legendLabel;
+                legendLabel = nullptr;
+            }
+        }
+        iter->second->detach();
+        iter->second->setSamples(QPolygonF());
     }
+    stObjectsCurveMap.clear();
 
     QList<int32_t> listType = objectsTypeId.keys();
 
@@ -730,10 +740,6 @@ void StSpaceDisplay::ShowObjects(const QMap<QString, QPolygonF> &stObjectsMap)
 
 void StSpaceDisplay::DrawObjects(const QMap<QString, QPolygonF> &stObjectsMap)
 {
-    if (stObjectsMap.isEmpty()) {
-        return;
-    }
-
     ShowObjects(stObjectsMap);
     UpdateObjectsTypeChoice();
 }