diff --git a/src/app/main.cpp b/src/app/main.cpp
index ac871f8..9b31f00 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -85,6 +85,7 @@
 
 #include "ApiClient.hpp"
 #include "AuthService.hpp"
+#include "DatasetDimension.hpp"
 #include "Credential.hpp"
 #include "Glyphs.hpp"
 #include "Logging.hpp"
@@ -590,15 +591,42 @@ void buildWorkbench(QMainWindow& window, geopro::data::LocalSampleRepository& re
                              }
                      });
 
-    // ── 左上对象树勾选 → 渲染勾选数据集（本期样本驱动：任意勾选 → 样本 ds "grid1"，空 → 清场）──
-    // 真实接 Api 时改为把勾选 TM 映射到其 ds 维度过滤后的真实 dsId 列表（spec §6.1/§8）。
-    QObject::connect(objectTree, &geopro::app::ObjectTreePanel::checkedTmsChanged, sceneCtrl,
-                     [sceneCtrl, emptyState](const QStringList& tmIds) {
-                         const bool hasData = !tmIds.isEmpty();
-                         emptyState->setVisible(!hasData);  // 有勾选→隐藏引导层，露出中央渲染
-                         sceneCtrl->setCheckedDatasets(
-                             hasData ? QStringList{QStringLiteral("grid1")} : QStringList{});
-                     });
+    // ── 左上对象树勾选 → 拉取各 TM 的 ds 子树，按维度分发到三栏列表（spec §6.1/§8）──
+    // 渲染由三栏勾选框驱动（Task 7：Column3DDataset::checkedDatasetsChanged → setCheckedDatasets）。
+    QObject::connect(
+        objectTree, &geopro::app::ObjectTreePanel::checkedTmsChanged, &window,
+        [&projectRepo, &nav, drawer, emptyState](const QStringList& tmIds) {
+            emptyState->setVisible(tmIds.isEmpty());  // 有勾选→隐藏引导层，露出中央渲染
+            if (tmIds.isEmpty()) {
+                drawer->col3D()->setDatasets({});
+                drawer->col2D()->setDatasets({});
+                drawer->colAnalysis()->setDatasets({});
+                return;
+            }
+            // 多 TM 异步汇总：每个 TM 取整棵 ds 子树,全部回来后按维度分发到三栏。
+            auto acc = std::make_shared<std::vector<geopro::data::DsRow>>();
+            auto remaining = std::make_shared<int>(tmIds.size());
+            auto finish = [acc, drawer]() {
+                geopro::app::DimBuckets b = geopro::app::splitByDimension(*acc);
+                drawer->col3D()->setDatasets(b.dim3D);
+                drawer->col2D()->setDatasets(b.dim2D);
+                drawer->colAnalysis()->setDatasets(b.analysis);
+            };
+            for (const QString& tm : tmIds) {
+                geopro::data::NavRequest* req = projectRepo.loadRowsAsync(
+                    nav.currentProjectId().toStdString(), tm.toStdString(), 2, 3, 1, 100000);
+                QObject::connect(req, &geopro::data::NavRequest::done, drawer,
+                                 [acc, remaining, finish](const QVariant& v) {
+                                     auto page = qvariant_cast<geopro::data::DsPage>(v);
+                                     acc->insert(acc->end(), page.rows.begin(), page.rows.end());
+                                     if (--(*remaining) == 0) finish();
+                                 });
+                QObject::connect(req, &geopro::data::NavRequest::failed, drawer,
+                                 [remaining, finish](const QString&) {
+                                     if (--(*remaining) == 0) finish();  // 单个失败不卡死,其余照常分发
+                                 });
+            }
+        });
 
     // ── 启动：建立一次中央视图。三栏重构后删除了 2D/3D 切换，统一固定为三维视图
     // （帘面默认开启 showCurtain_=true，勾选 dd_section → 帘面）。无勾选 → 空场景 + 背景。