diff --git a/src/StkTable/features/useAreaSelection.ts b/src/StkTable/features/useAreaSelection.ts
index edbdafc2..63eea823 100644
--- a/src/StkTable/features/useAreaSelection.ts
+++ b/src/StkTable/features/useAreaSelection.ts
@@ -158,6 +158,51 @@ export function useAreaSelection<DT extends Record<string, any>>(
 
     /** 根据 selectionRanges 计算所有选区内 cellKey 的并集（非响应式，用于 DOM 操作） */
     let selectedCellKeys: Set<string> = new Set();
+    let observedThead: HTMLTableSectionElement | null = null;
+    let observedTfoot: HTMLTableSectionElement | null = null;
+    let cachedHeaderHeight = 0;
+    let cachedFooterHeight = 0;
+    const sectionResizeObserver =
+        typeof ResizeObserver === 'undefined'
+            ? null
+            : new ResizeObserver(entries => {
+                  for (const entry of entries) {
+                      const height = entry.target.getBoundingClientRect().height;
+                      if (entry.target === observedThead) cachedHeaderHeight = height;
+                      if (entry.target === observedTfoot) cachedFooterHeight = height;
+                  }
+              });
+
+    function observeTableSection(
+        next: HTMLTableSectionElement | null,
+        current: HTMLTableSectionElement | null,
+        setCurrent: (section: HTMLTableSectionElement | null) => void,
+        setHeight: (height: number) => void,
+    ) {
+        if (next === current) return;
+        if (current) sectionResizeObserver?.unobserve(current);
+        setCurrent(next);
+        setHeight(next?.getBoundingClientRect().height ?? 0);
+        if (next) sectionResizeObserver?.observe(next);
+    }
+
+    function getTableSectionHeights(container: HTMLElement) {
+        const thead = container.querySelector<HTMLTableSectionElement>('thead');
+        const tfoot = container.querySelector<HTMLTableSectionElement>('tfoot');
+        observeTableSection(
+            thead,
+            observedThead,
+            section => (observedThead = section),
+            height => (cachedHeaderHeight = height),
+        );
+        observeTableSection(
+            tfoot,
+            observedTfoot,
+            section => (observedTfoot = section),
+            height => (cachedFooterHeight = height),
+        );
+        return [cachedHeaderHeight, cachedFooterHeight] as const;
+    }
 
     /** 重新计算 selectedCellKeys */
     function recomputeSelectedCellKeys() {
@@ -235,6 +280,22 @@ export function useAreaSelection<DT extends Record<string, any>>(
             const lastRange = ranges[ranges.length - 1];
             const { minRow: lrMinRow, maxRow: lrMaxRow, minCol: lrMinCol, maxCol: lrMaxCol } = normalizeRange(lastRange);
 
+            // 键盘导航的常见路径只有一个单元格，直接定位目标行和列，
+            // 避免每次按键都扫描全部可见行。
+            if (ranges.length === 1 && lrMinRow === lrMaxRow && lrMinCol === lrMaxCol) {
+                const tr = tbody.querySelector(`tr[data-row-i="${lrMinRow}"]`);
+                const col = tableHeaderLast.value[lrMinCol];
+                const targetColKey = col ? String(colKeyGen.value(col)) : '';
+                const cells = tr?.querySelectorAll('td[data-col-key]') ?? [];
+                for (let i = 0; i < cells.length; i++) {
+                    const td = cells[i] as HTMLElement;
+                    if (td.getAttribute('data-col-key') !== targetColKey) continue;
+                    td.classList.add(CELL_RANGE_SELECTED, CELL_RANGE_TOP, CELL_RANGE_BOTTOM, CELL_RANGE_LEFT, CELL_RANGE_RIGHT);
+                    break;
+                }
+                return;
+            }
+
             // 遍历所有可见行
             const trs = tbody.querySelectorAll('tr[data-row-i]');
             for (let t = 0; t < trs.length; t++) {
@@ -317,6 +378,7 @@ export function useAreaSelection<DT extends Record<string, any>>(
     });
     onBeforeUnmount(() => {
         removeListener();
+        sectionResizeObserver?.disconnect();
     });
 
     /**
@@ -860,10 +922,7 @@ export function useAreaSelection<DT extends Record<string, any>>(
         const col = tableHeaderLast.value[colIndex];
         if (!row || !col) return;
 
-        const thead = container.querySelector('thead');
-        const headerHeight = thead ? thead.offsetHeight : 0;
-        const tfoot = container.querySelector('tfoot');
-        const footerHeight = tfoot ? tfoot.offsetHeight : 0;
+        const [headerHeight, footerHeight] = getTableSectionHeights(container);
 
         const vs = virtualScroll.value;
         const vsx = virtualScrollX.value;
diff --git a/lib/StkTable-QUd4TJCF.js b/lib/StkTable-QUd4TJCF.js
index 512545c2..80fc32bd 100644
--- a/lib/StkTable-QUd4TJCF.js
+++ b/lib/StkTable-QUd4TJCF.js
@@ -444,6 +444,31 @@ function useAreaSelection(props, emits, tableContainerRef, dataSourceCopy, table
 	});
 	/** 根据 selectionRanges 计算所有选区内 cellKey 的并集（非响应式，用于 DOM 操作） */
 	let selectedCellKeys = /* @__PURE__ */ new Set();
+	let observedThead = null;
+	let observedTfoot = null;
+	let cachedHeaderHeight = 0;
+	let cachedFooterHeight = 0;
+	const sectionResizeObserver = typeof ResizeObserver === "undefined" ? null : new ResizeObserver((entries) => {
+		for (const entry of entries) {
+			const height = entry.target.getBoundingClientRect().height;
+			if (entry.target === observedThead) cachedHeaderHeight = height;
+			if (entry.target === observedTfoot) cachedFooterHeight = height;
+		}
+	});
+	function observeTableSection(next, current, setCurrent, setHeight) {
+		if (next === current) return;
+		if (current) sectionResizeObserver?.unobserve(current);
+		setCurrent(next);
+		setHeight(next?.getBoundingClientRect().height ?? 0);
+		if (next) sectionResizeObserver?.observe(next);
+	}
+	function getTableSectionHeights(container) {
+		const thead = container.querySelector("thead");
+		const tfoot = container.querySelector("tfoot");
+		observeTableSection(thead, observedThead, (section) => observedThead = section, (height) => cachedHeaderHeight = height);
+		observeTableSection(tfoot, observedTfoot, (section) => observedTfoot = section, (height) => cachedFooterHeight = height);
+		return [cachedHeaderHeight, cachedFooterHeight];
+	}
 	/** 重新计算 selectedCellKeys */
 	function recomputeSelectedCellKeys() {
 		const ranges = selectionRanges.value;
@@ -497,6 +522,19 @@ function useAreaSelection(props, emits, tableContainerRef, dataSourceCopy, table
 		if (cellHighlight) {
 			const lastRange = ranges[ranges.length - 1];
 			const { minRow: lrMinRow, maxRow: lrMaxRow, minCol: lrMinCol, maxCol: lrMaxCol } = normalizeRange(lastRange);
+			if (ranges.length === 1 && lrMinRow === lrMaxRow && lrMinCol === lrMaxCol) {
+				const tr = tbody.querySelector(`tr[data-row-i="${lrMinRow}"]`);
+				const col = tableHeaderLast.value[lrMinCol];
+				const targetColKey = col ? String(colKeyGen.value(col)) : "";
+				const cells = tr?.querySelectorAll("td[data-col-key]") ?? [];
+				for (let i = 0; i < cells.length; i++) {
+					const td = cells[i];
+					if (td.getAttribute("data-col-key") !== targetColKey) continue;
+					td.classList.add(CELL_RANGE_SELECTED, CELL_RANGE_TOP, CELL_RANGE_BOTTOM, CELL_RANGE_LEFT, CELL_RANGE_RIGHT);
+					break;
+				}
+				return;
+			}
 			const trs = tbody.querySelectorAll("tr[data-row-i]");
 			for (let t = 0; t < trs.length; t++) {
 				const tr = trs[t];
@@ -559,6 +597,7 @@ function useAreaSelection(props, emits, tableContainerRef, dataSourceCopy, table
 	});
 	onBeforeUnmount(() => {
 		removeListener();
+		sectionResizeObserver?.disconnect();
 	});
 	/**
 	* 监听数据行数/列数变化，当行列变少时钳制选区与锚点，避免越界
@@ -966,10 +1005,7 @@ function useAreaSelection(props, emits, tableContainerRef, dataSourceCopy, table
 		const row = dataSourceCopy.value[rowIndex];
 		const col = tableHeaderLast.value[colIndex];
 		if (!row || !col) return;
-		const thead = container.querySelector("thead");
-		const headerHeight = thead ? thead.offsetHeight : 0;
-		const tfoot = container.querySelector("tfoot");
-		const footerHeight = tfoot ? tfoot.offsetHeight : 0;
+		const [headerHeight, footerHeight] = getTableSectionHeights(container);
 		const vs = virtualScroll.value;
 		const vsx = virtualScrollX.value;
 		const isScrollRowByRow = props.scrollRowByRow;