diff --git a/src/app/panels/columns/Column2DDataset.cpp b/src/app/panels/columns/Column2DDataset.cpp
index ca32f10..2bacdb4 100644
--- a/src/app/panels/columns/Column2DDataset.cpp
+++ b/src/app/panels/columns/Column2DDataset.cpp
@@ -27,6 +27,7 @@ Column2DDataset::Column2DDataset(QWidget* parent) : QWidget(parent) {
         basemap->addItem(QStringLiteral("天地图"));
         basemap->addItem(QStringLiteral("Google Map"));
         basemap->addItem(QStringLiteral("隐藏"));
+        basemap->setCurrentIndex(2);  // 默认隐藏：选「天地图」即触发 currentIndexChanged→显示
         connect(basemap, qOverload<int>(&QComboBox::currentIndexChanged), this,
                 [this](int index) { emit basemapChanged(index); });
         form->addRow(QStringLiteral("底图源"), basemap);