diff --git a/src/app/main.cpp b/src/app/main.cpp
index 0dd51b7..76aaa46 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -608,10 +608,12 @@ void buildWorkbench(QMainWindow& window, geopro::data::LocalSampleRepository& re
                 if (!ok) return;
                 scene3dRepo->createSlice(
                     spec, name.isEmpty() ? std::string("切片") : name.toStdString(),
-                    [interactionMgr, refreshAnalysis](std::string newId) {
+                    [interactionMgr, refreshAnalysis, drawer](std::string newId) {
                         interactionMgr->tagSelectedSlice(newId);  // 链接当前切片 → 新数据集（不重绘）
-                        refreshAnalysis();                         // 新行进列表（勾选集不变→不发多余信号）
-                        // TODO：新分段 tab 暂无 setItemChecked，新切片列表默认未勾（已渲染但列表不打勾，待补）。
+                        refreshAnalysis();                         // 新行进列表
+                        // 新切片自动勾选 → 列表打勾 + 保持渲染（refreshAnalysis 已重建列表，故在其后勾选）。
+                        if (auto* sec = drawer->analysisTab()->section("voxel"))
+                            sec->setChecked(QString::fromStdString(newId), true);
                     },
                     [&window](const std::string& m) {
                         QMessageBox::warning(&window, QStringLiteral("保存切片"),
diff --git a/src/app/panels/columns/CategoryAnalysisTab.cpp b/src/app/panels/columns/CategoryAnalysisTab.cpp
index 1b52992..f9adedf 100644
--- a/src/app/panels/columns/CategoryAnalysisTab.cpp
+++ b/src/app/panels/columns/CategoryAnalysisTab.cpp
@@ -59,6 +59,10 @@ CategoryAnalysisTab::CategoryAnalysisTab(geopro::data::DatasetFieldDictionary* d
 void CategoryAnalysisTab::setBuckets(const CategoryBuckets& b) {
     const auto& cfg = categoryConfigs();
     for (std::size_t i = 0; i < cfg.size() && i < b.segments.size(); ++i) {
+        // voxel(三维体) 段数据来自 mock voxelTree(体/切片/异常)，由调用方单独 section("voxel")->setDatasets
+        //   注入；splitByCategory 对它永远是空桶，若在此用空桶覆盖会先清掉其勾选(随后重填但勾选已丢) →
+        //   表现为「创建切片/异常后体/切片选择被清空」(用户 issue 1)。故跳过 voxel，勿覆盖。
+        if (cfg[i].id == "voxel") continue;
         if (auto* sec = section(cfg[i].id)) sec->setDatasets(b.segments[i]);
     }
 }
diff --git a/src/app/panels/columns/CategorySection.cpp b/src/app/panels/columns/CategorySection.cpp
index c76e765..a37252f 100644
--- a/src/app/panels/columns/CategorySection.cpp
+++ b/src/app/panels/columns/CategorySection.cpp
@@ -116,6 +116,15 @@ void CategorySection::setDatasets(const std::vector<DsRow>& rows) {
     rebuildList();
 }
 
+void CategorySection::setChecked(const QString& dsId, bool on) {
+    for (QTreeWidgetItemIterator it(list_); *it; ++it)
+        if ((*it)->data(0, kDsIdRole).toString() == dsId &&
+            ((*it)->flags() & Qt::ItemIsUserCheckable)) {
+            (*it)->setCheckState(0, on ? Qt::Checked : Qt::Unchecked);  // 触发 itemChanged→emitChecked→渲染
+            return;
+        }
+}
+
 void CategorySection::refreshArrayCombo() {
     if (!spec_.hasArrayTypeFilter || !arrayCombo_) return;
     const QString prev = arrayCombo_->currentData().toString();
diff --git a/src/app/panels/columns/CategorySection.hpp b/src/app/panels/columns/CategorySection.hpp
index af8c195..7882c57 100644
--- a/src/app/panels/columns/CategorySection.hpp
+++ b/src/app/panels/columns/CategorySection.hpp
@@ -32,6 +32,7 @@ public:
     // 对象树同源的扁平 GS/TM 节点（段体容器分层用；Task 12 接入真实结构，当前仅存储）。
     void setStructure(const std::vector<geopro::data::StructNode>& nodes);
     void setDatasets(const std::vector<geopro::data::DsRow>& rows);
+    void setChecked(const QString& dsId, bool on);  // 按 dsId 勾选/取消(新建切片自动勾选等场景)
     const CategorySpec& spec() const { return spec_; }
 
 signals:
diff --git a/src/data/api/Api3dRepository.cpp b/src/data/api/Api3dRepository.cpp
index 79e8400..02e4e63 100644
--- a/src/data/api/Api3dRepository.cpp
+++ b/src/data/api/Api3dRepository.cpp
@@ -416,6 +416,9 @@ void Api3dRepository::saveAnomaly(const geopro::core::Anomaly& a,
     if (id.empty()) id = "anomaly-" + std::to_string(++anomalyCounter_);  // 新建 → 生成 id
     geopro::core::Anomaly stored = a;
     stored.id = id;
+    if (stored.createTime.empty())  // mock：构建时未设创建时刻 → 补当前时间（副标题/列表显示）
+        stored.createTime =
+            QDateTime::currentDateTime().toString(QStringLiteral("yyyy-MM-dd HH:mm")).toStdString();
     anomalies_[id] = StoredAnomaly{std::move(stored), screenshotPngPath};
     onOk(id);
 }