diff --git a/package-lock.json b/package-lock.json
index 66f3eae..fa2f90e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -26,6 +26,7 @@
                 "clipboard": "^2.0.11",
                 "crypto-js": "^4.2.0",
                 "dayjs": "^1.11.13",
+                "geomagnetism": "^0.2.0",
                 "lodash-es": "^4.17.21",
                 "pinia": "^2.3.0",
                 "pinia-plugin-persistedstate": "^4.2.0",
@@ -7409,6 +7410,11 @@
                 "node": ">=6.9.0"
             }
         },
+        "node_modules/geomagnetism": {
+            "version": "0.2.0",
+            "resolved": "https://registry.npmmirror.com/geomagnetism/-/geomagnetism-0.2.0.tgz",
+            "integrity": "sha512-dO8HJrXqah244nMe+pU5m52L90SMoi4lDA0AV3xunRxogloYV+s3aYWCW72VMMfiYis+YSAlhoKktw8aLMiJbw=="
+        },
         "node_modules/get-caller-file": {
             "version": "2.0.5",
             "resolved": "https://repo.huaweicloud.com/repository/npm/get-caller-file/-/get-caller-file-2.0.5.tgz",
diff --git a/package.json b/package.json
index de6096a..3e2edac 100644
--- a/package.json
+++ b/package.json
@@ -52,6 +52,7 @@
         "clipboard": "^2.0.11",
         "crypto-js": "^4.2.0",
         "dayjs": "^1.11.13",
+        "geomagnetism": "^0.2.0",
         "lodash-es": "^4.17.21",
         "pinia": "^2.3.0",
         "pinia-plugin-persistedstate": "^4.2.0",
diff --git a/src/hooks/useGeomagnetism.js b/src/hooks/useGeomagnetism.js
new file mode 100644
index 0000000..7abe834
--- /dev/null
+++ b/src/hooks/useGeomagnetism.js
@@ -0,0 +1,66 @@
+import geomagnetism from 'geomagnetism';
+
+export function useGeomagnetism() {
+  const bd09toWgs84 = (bd_lat, bd_lng) => {
+    const x_pi = (3.14159265358979324 * 3000.0) / 180.0;
+    const x = Number(bd_lng) - 0.0065;
+    const y = Number(bd_lat) - 0.006;
+    const z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
+    const theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
+    return {
+      lat: z * Math.sin(theta) - 0.002,
+      lng: z * Math.cos(theta) - 0.005
+    };
+  };
+
+  const calculate = (latitude, longitude, altitude = 0) => {
+    try {
+      // 强制转换
+      const numLat = parseFloat(latitude);
+      const numLng = parseFloat(longitude);
+
+      if (isNaN(numLat) || isNaN(numLng)) {
+        console.warn('磁偏角计算: 无效的经纬度', { latitude, longitude });
+        return { declination: 0, success: false };
+      }
+
+      const wgs = bd09toWgs84(numLat, numLng);
+      
+      // 获取地磁模型 - geomagnetism.model(date) 返回模型实例
+      const model = geomagnetism.model(new Date());
+      
+      if (!model || typeof model.point !== 'function') {
+        console.error("无法加载地磁模型或模型没有point方法");
+        return { declination: 0, success: false };
+      }
+
+      // point() 方法接受数组参数 [lat, lon, altitude]
+      // 根据库源码，参数顺序是 [lat, lon, altitude]
+      const info = model.point([wgs.lat, wgs.lng, altitude]);
+
+      if (!info) {
+        console.error('model.point() 返回 null 或 undefined');
+        return { declination: 0, success: false };
+      }
+
+      // 根据 geomagnetism 库的类型定义，返回值属性名是 decl（不是 declination）
+      const decl = info.decl;
+
+      if (typeof decl !== 'number' || isNaN(decl)) {
+        console.warn('磁偏角值无效:', decl, 'info对象:', info);
+        return { declination: 0, success: false };
+      }
+
+      return {
+        declination: decl,
+        success: true
+      };
+    } catch (e) {
+      console.error('磁偏角计算过程出错:', e);
+      console.error('错误堆栈:', e.stack);
+      return { declination: 0, success: false };
+    }
+  };
+
+  return { calculate };
+}
\ No newline at end of file