diff --git a/lib/Controller/gnss_controller.dart b/lib/Controller/gnss_controller.dart
index da9eeb9..20e08c9 100644
--- a/lib/Controller/gnss_controller.dart
+++ b/lib/Controller/gnss_controller.dart
@@ -10,15 +10,15 @@ class GnssController extends GetxController {
 
   var singnalUpdate = 0.obs;
 
-  // Map<String, bool> selectedSignal = {
-  //   "GPS": true,
-  //   "GLONASS": true,
-  //   "GALILEO": true,
-  //   "BEIDOU": true,
-  //   "QZSS": true,
-  //   "SBAS": true,
-  // }.obs;
-  final selectedSignal = <bool>[false, false, false, false, false].obs; //天空图
+  Map<String, bool> selectedSignal = {
+    "GPS": true,
+    "GLONASS": true,
+    "GALILEO": true,
+    "BEIDOU": true,
+    "QZSS": true,
+    "SBAS": true,
+  }.obs;
+  // final selectedSignal = Map<String,bool>{false, false, false, false, false};
   final QselectedSignal = <bool>[false, false, false, false, false].obs; //信号质量
 
   @override
diff --git a/lib/sky/sky_plot.dart b/lib/sky/sky_plot.dart
index 3199795..44d4525 100644
--- a/lib/sky/sky_plot.dart
+++ b/lib/sky/sky_plot.dart
@@ -1,24 +1,28 @@
-import 'dart:convert';
 import 'dart:math';
-import 'dart:typed_data';
 import 'dart:ui' as ui;
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
-import 'package:flutter/widgets.dart';
 import 'package:get/get.dart';
 import 'package:gnss/gnss.dart';
 
 import '../Controller/gnss_controller.dart';
 
-const signalNameList = <String>["GPS", "GLONASS", "GALILEO", "BEIDOU", "QZSS"];
-const signalPrefixList = <String>["G", "R", "E", "B", "Q"];
-const List<Color> signalColorList = [
-  Color.fromARGB(255, 255, 0, 0),
-  Color.fromARGB(255, 0, 255, 0),
-  Color.fromARGB(255, 0, 0, 255),
-  Color.fromARGB(255, 255, 255, 0),
-  Color.fromARGB(255, 0, 255, 255)
-];
+// const signalNameList = <String>["GPS", "GLONASS", "GALILEO", "BEIDOU", "QZSS"];
+const Map<String, String> signalPrefixList = {
+  "GPS": "G",
+  "GLONASS": "N",
+  "GALILEO": "E",
+  "BEIDOU": "B",
+  "QZSS": "Q"
+};
+const Map<String, Color> signalColorMap = {
+  "GPS": Color.fromARGB(255, 255, 0, 0),
+  "GLONASS": Color.fromARGB(255, 0, 255, 0),
+  "GALILEO": Color.fromARGB(255, 0, 0, 255),
+  "BEIDOU": Color.fromARGB(255, 255, 255, 0),
+  "QZSS": Color.fromARGB(255, 0, 255, 255),
+};
+
 // class DrawSkyPlot {
 //   double width = 500;
 //   double height = 500;
@@ -212,18 +216,12 @@ class SkyPlotPage extends StatelessWidget {
     final size = MediaQuery.of(context).size;
     return Obx(() {
       controller.singnalUpdate.value;
-      final signalGNSS = [
-        controller.signalData?.GPS,
-        controller.signalData?.GLO,
-        controller.signalData?.GAL,
-        controller.signalData?.BDS,
-        controller.signalData?.QZSS,
-      ];
       return SizedBox(
         width: size.width,
         height: size.height,
         child: CustomPaint(
-          painter: SkyPlotPainter(signalGNSS, controller.selectedSignal),
+          painter:
+              SkyPlotPainter(controller.signalData, controller.selectedSignal),
         ),
       );
     });
@@ -273,10 +271,10 @@ class SkyPlotPage extends StatelessWidget {
 // }
 
 class SkyPlotPainter extends CustomPainter {
-  final List<List<SignalGNSS>?> signalGNSS;
-  final List<bool> selectedSignal;
+  final SignalData? signalData;
+  final Map<String, bool> selectedSignal;
   final satelliteRadius = 12.0;
-  SkyPlotPainter(this.signalGNSS, this.selectedSignal);
+  SkyPlotPainter(this.signalData, this.selectedSignal);
 
   @override
   void paint(Canvas canvas, Size size) {
@@ -300,18 +298,17 @@ class SkyPlotPainter extends CustomPainter {
       double y = center.dy + radius * sin(radians);
       canvas.drawLine(center, Offset(x, y), paint);
     }
-
+    if (signalData == null) {
+      return;
+    }
     // Draw satellite positions
     final satellitePaint = Paint()..style = PaintingStyle.fill;
-
-    for (int i = 0; i < signalGNSS.length; i++) {
-      final signalData = signalGNSS[i];
-      if (!selectedSignal[i] || signalData == null) {
-        continue;
+    signalData!.forEach((key, value) {
+      if (selectedSignal[key] == true) {
+        satellitePaint.color = signalColorMap[key] ?? Colors.yellow;
+        drawGnssSignal(canvas, center, radius, value, satellitePaint, key);
       }
-      satellitePaint.color = signalColorList[i];
-      drawGnssSignal(canvas, center, radius, signalData, satellitePaint, i);
-    }
+    });
   }
 
   void drawGnssSignal(
@@ -320,7 +317,7 @@ class SkyPlotPainter extends CustomPainter {
     double radius,
     List<SignalGNSS> signals,
     Paint paint,
-    int index,
+    String neme,
   ) {
     for (final signal in signals) {
       final int el = signal.elevation;
@@ -334,8 +331,8 @@ class SkyPlotPainter extends CustomPainter {
       canvas.drawCircle(Offset(x, y), satelliteRadius, paint);
       TextPainter(
         text: TextSpan(
-          text: signalPrefixList[index] + signal.prn.toString().padLeft(2, '0'),
-          style: TextStyle(color: Colors.white, fontSize: 12),
+          text: signalPrefixList[neme] + signal.prn.toString().padLeft(2, '0'),
+          style: const TextStyle(color: Colors.white, fontSize: 12),
         ),
         textDirection: TextDirection.ltr,
       )
diff --git a/pubspec.lock b/pubspec.lock
index 49e53f7..d15c25d 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -120,7 +120,7 @@ packages:
     description:
       path: "."
       ref: main
-      resolved-ref: "05b6cd1985ad7f13a487820f4cfa1e9622e2daae"
+      resolved-ref: "13bca7191808a98707e61f119994a91ebc35f11a"
       url: "https://git.mcxa.cn:89/flutter/gnss.git"
     source: git
     version: "0.0.1"