diff --git a/src/app/CMakeLists.txt b/src/app/CMakeLists.txt
index 9f06ef4..ef60b00 100644
--- a/src/app/CMakeLists.txt
+++ b/src/app/CMakeLists.txt
@@ -84,6 +84,7 @@ add_executable(geopro_desktop WIN32
   panels/columns/CategoryAnalysisTab.cpp
   panels/columns/DateRangeEdit.cpp
   panels/columns/ColumnDrawer.cpp
+  panels/columns/SectionIconBar.cpp
   panels/AnomalyTablePanel.cpp
   panels/LoadingOverlay.cpp
   panels/DatasetDetailPage.cpp
diff --git a/src/app/panels/columns/SectionIconBar.cpp b/src/app/panels/columns/SectionIconBar.cpp
new file mode 100644
index 0000000..9a03dda
--- /dev/null
+++ b/src/app/panels/columns/SectionIconBar.cpp
@@ -0,0 +1,143 @@
+#include "panels/columns/SectionIconBar.hpp"
+
+#include <QAction>
+#include <QHBoxLayout>
+#include <QMenu>
+#include <QResizeEvent>
+#include <QSize>
+#include <QToolButton>
+#include <algorithm>
+
+#include "Glyphs.hpp"
+#include "Theme.hpp"
+
+namespace geopro::app {
+
+int visibleIconCount(int totalIcons, int availablePx, int iconPx, int overflowPx, int maxIcons) {
+    if (totalIcons <= 0 || iconPx <= 0) return 0;
+    const int ideal = std::min(totalIcons, std::max(0, maxIcons));
+    const bool overflowFromCap = totalIcons > ideal;  // 超 max → 必有溢出位
+    // 先看理想数能否放下（若已因 cap 溢出，理想数也要含溢出位）
+    auto fits = [&](int n, bool withOverflow) {
+        return n * iconPx + (withOverflow ? overflowPx : 0) <= availablePx;
+    };
+    int n = ideal;
+    bool overflow = overflowFromCap;
+    while (n > 0 && !fits(n, overflow || (totalIcons > n))) {
+        --n;
+        overflow = true;  // 一旦减少必有「…」
+    }
+    if (n < 0) n = 0;
+    return n;
+}
+
+namespace {
+constexpr int kGlyphPx = 18;  // glyph 绘制像素；按钮本体宽用 iconPx_，与溢出计算口径一致
+
+// glyphKey 字符串 → Glyph 枚举（C2 按段头操作填键；未知键回退中性图标）。
+Glyph glyphFromKey(const QString& key) {
+    const QString k = key.toLower();
+    if (k == QStringLiteral("plus")) return Glyph::Plus;
+    if (k == QStringLiteral("filter")) return Glyph::Filter;
+    if (k == QStringLiteral("upload")) return Glyph::Upload;
+    if (k == QStringLiteral("download")) return Glyph::Download;
+    if (k == QStringLiteral("collapse")) return Glyph::Collapse;
+    if (k == QStringLiteral("fullscreen")) return Glyph::Fullscreen;
+    if (k == QStringLiteral("map")) return Glyph::Map;
+    if (k == QStringLiteral("detail")) return Glyph::Detail;
+    if (k == QStringLiteral("property")) return Glyph::Property;
+    if (k == QStringLiteral("gear")) return Glyph::Gear;
+    return Glyph::Property;
+}
+}  // namespace
+
+SectionIconBar::SectionIconBar(QWidget* parent) : QWidget(parent) {
+    auto* lay = new QHBoxLayout(this);
+    lay->setContentsMargins(0, 0, 0, 0);
+    lay->setSpacing(0);
+}
+
+void SectionIconBar::setActions(const std::vector<IconAction>& a) {
+    // 清旧按钮与溢出按钮
+    for (auto* b : btns_) {
+        if (b) b->deleteLater();
+    }
+    btns_.clear();
+    if (overflowBtn_) {
+        overflowBtn_->deleteLater();
+        overflowBtn_ = nullptr;
+    }
+
+    actions_ = a;
+    auto* lay = qobject_cast<QHBoxLayout*>(layout());
+    const QColor ic = tokenColor("text/secondary");
+
+    for (const IconAction& act : actions_) {
+        auto* b = new QToolButton(this);
+        b->setIcon(makeGlyph(glyphFromKey(act.glyphKey), ic, kGlyphPx));
+        b->setIconSize(QSize(kGlyphPx, kGlyphPx));
+        b->setAutoRaise(true);
+        b->setToolTip(act.tooltip);
+        b->setFixedSize(iconPx_, iconPx_);
+        if (act.popupBuilder) {
+            const auto builder = act.popupBuilder;
+            QToolButton* host = b;
+            connect(b, &QToolButton::clicked, this, [builder, host] { builder(host); });
+        } else if (act.onClick) {
+            const auto cb = act.onClick;
+            connect(b, &QToolButton::clicked, this, [cb] { cb(); });
+        }
+        if (lay) lay->addWidget(b);
+        btns_.push_back(b);
+    }
+
+    // 末尾「…」溢出按钮：即点即弹菜单
+    overflowBtn_ = new QToolButton(this);
+    overflowBtn_->setText(QStringLiteral("…"));
+    overflowBtn_->setAutoRaise(true);
+    overflowBtn_->setToolTip(QStringLiteral("更多"));
+    overflowBtn_->setFixedSize(overflowPx_, iconPx_);
+    overflowBtn_->setPopupMode(QToolButton::InstantPopup);
+    overflowBtn_->setMenu(new QMenu(overflowBtn_));
+    if (lay) lay->addWidget(overflowBtn_);
+
+    relayout();
+}
+
+void SectionIconBar::resizeEvent(QResizeEvent* e) {
+    QWidget::resizeEvent(e);
+    relayout();
+}
+
+void SectionIconBar::relayout() {
+    const int total = static_cast<int>(actions_.size());
+    const int vis = visibleIconCount(total, width(), iconPx_, overflowPx_, maxIcons_);
+
+    QMenu* menu = overflowBtn_ ? overflowBtn_->menu() : nullptr;
+    if (menu) menu->clear();
+
+    for (int i = 0; i < total; ++i) {
+        QToolButton* b = btns_[static_cast<size_t>(i)];
+        if (!b) continue;
+        if (i < vis) {
+            b->setVisible(true);
+            continue;
+        }
+        b->setVisible(false);
+        if (!menu) continue;
+        const IconAction& act = actions_[static_cast<size_t>(i)];
+        QAction* ma = menu->addAction(act.tooltip);
+        if (act.popupBuilder) {
+            const auto builder = act.popupBuilder;
+            QToolButton* host = overflowBtn_;
+            connect(ma, &QAction::triggered, this, [builder, host] { builder(host); });
+        } else if (act.onClick) {
+            const auto cb = act.onClick;
+            connect(ma, &QAction::triggered, this, [cb] { cb(); });
+        }
+    }
+
+    if (overflowBtn_) overflowBtn_->setVisible(vis < total);
+}
+
+}  // namespace geopro::app
diff --git a/src/app/panels/columns/SectionIconBar.hpp b/src/app/panels/columns/SectionIconBar.hpp
new file mode 100644
index 0000000..706a1bd
--- /dev/null
+++ b/src/app/panels/columns/SectionIconBar.hpp
@@ -0,0 +1,41 @@
+#pragma once
+#include <QWidget>
+#include <QString>
+#include <functional>
+#include <vector>
+
+class QToolButton;
+class QResizeEvent;
+
+namespace geopro::app {
+
+// 纯逻辑：给定约束返回可见图标数（其余收进「…」）。见 spec §6。
+int visibleIconCount(int totalIcons, int availablePx, int iconPx, int overflowPx, int maxIcons);
+
+// 段头响应式图标工具条：≤maxIcons 且宽度够则全显；否则右侧依次收进末尾「…」下拉。
+struct IconAction {
+    QString glyphKey;   // 图标键（映射到 Glyph）
+    QString tooltip;
+    std::function<void()> onClick;  // 直接动作；为空则用 popupBuilder
+    std::function<void(QToolButton*)> popupBuilder;  // 弹 popup（z值/底图/筛选用）
+};
+
+class SectionIconBar : public QWidget {
+    Q_OBJECT
+public:
+    explicit SectionIconBar(QWidget* parent = nullptr);
+    void setActions(const std::vector<IconAction>& actions);  // 重建按钮
+    void setMaxIcons(int n) { maxIcons_ = n; relayout(); }
+protected:
+    void resizeEvent(QResizeEvent* e) override;
+private:
+    void relayout();  // 按当前宽度算可见数，多余进「…」菜单
+    std::vector<IconAction> actions_;
+    std::vector<QToolButton*> btns_;
+    QToolButton* overflowBtn_ = nullptr;
+    int maxIcons_ = 3;
+    int iconPx_ = 30;
+    int overflowPx_ = 30;
+};
+
+}  // namespace geopro::app
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index c4316c2..41454f2 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -184,6 +184,16 @@ target_sources(geopro_tests PRIVATE
 )
 # 对象树勾选纯逻辑（GS 三态聚合 aggregateGsState + 勾选源去重 dedupeSources，header-only）。
 target_sources(geopro_tests PRIVATE app/test_object_tree_selection.cpp)
+# 段头响应式图标工具条溢出计算纯逻辑（visibleIconCount，见 spec §6）。SectionIconBar.cpp 还含
+# QWidget 组件，其按钮构造依赖 makeGlyph(Glyphs.cpp) 与主题(Theme.cpp)，故一并加入并链 Qt6::Widgets/Svg。
+find_package(Qt6 COMPONENTS Widgets Svg REQUIRED)
+target_sources(geopro_tests PRIVATE
+    app/test_section_icon_bar.cpp
+    ${CMAKE_SOURCE_DIR}/src/app/panels/columns/SectionIconBar.cpp
+    ${CMAKE_SOURCE_DIR}/src/app/Glyphs.cpp
+    ${CMAKE_SOURCE_DIR}/src/app/Theme.cpp
+)
+target_link_libraries(geopro_tests PRIVATE Qt6::Widgets Qt6::Svg)
 # measurement 散点纯逻辑（值类型变换 / 显隐 id 收集 / 过滤体 / 另存体，Qt6::Core JSON + core model）。
 target_sources(geopro_tests PRIVATE
     app/test_scatter_data_ops.cpp
diff --git a/tests/app/test_section_icon_bar.cpp b/tests/app/test_section_icon_bar.cpp
new file mode 100644
index 0000000..980bcc1
--- /dev/null
+++ b/tests/app/test_section_icon_bar.cpp
@@ -0,0 +1,24 @@
+#include <gtest/gtest.h>
+#include "panels/columns/SectionIconBar.hpp"
+
+using geopro::app::visibleIconCount;
+
+TEST(SectionIconBar, ShowsAllWhenWideEnoughAndUnderMax) {
+    // 3 图标, 宽 1000, 每个 30, 溢出 30, max 3 → 全显
+    EXPECT_EQ(visibleIconCount(3, 1000, 30, 30, 3), 3);
+}
+TEST(SectionIconBar, CapsAtMaxIcons) {
+    // 5 图标但 max 3, 宽足够 → 显 3, 其余 2 进溢出(此时需留溢出位)
+    EXPECT_EQ(visibleIconCount(5, 1000, 30, 30, 3), 3);
+}
+TEST(SectionIconBar, FoldsRightWhenNarrow) {
+    // 3 图标, max 3, 但宽只够 2 个 + 溢出: 75px, 30 each, overflow 30 → 2*30+30=90>75 → 1*30+30=60<=75 → 1
+    EXPECT_EQ(visibleIconCount(3, 75, 30, 30, 3), 1);
+}
+TEST(SectionIconBar, NoOverflowReserveWhenAllFit) {
+    // 2 图标全显且 <=max, 不需溢出位: 宽 60 恰好 2*30
+    EXPECT_EQ(visibleIconCount(2, 60, 30, 30, 3), 2);
+}
+TEST(SectionIconBar, ZeroWhenTooNarrow) {
+    EXPECT_EQ(visibleIconCount(3, 20, 30, 30, 3), 0);
+}