diff --git a/GEE_Scripts/S1andS2_download.js b/GEE_Scripts/S1andS2_download.js
index 7ee8193..5efc89c 100644
--- a/GEE_Scripts/S1andS2_download.js
+++ b/GEE_Scripts/S1andS2_download.js
@@ -26,10 +26,10 @@ var region = ee.FeatureCollection(
   demoPoints
     .filter(ee.Filter.eq("Name", region_name))
     .geometry()
-    .buffer(2500)
+    .buffer(3000)
     .bounds()
 );
-var start_year = 2025;
+var start_year = 2018;
 var end_year = 2025;
 var start_date = start_year + "-" + "01-01";
 var end_date = start_year + "-" + "12-31";
@@ -38,7 +38,7 @@ var cloud_threshold = 100; // 最大云量阈值
 var QA_BAND = "cs_cdf";
 // The threshold for masking; values between 0.50 and 0.65 generally work well.
 // Higher values will remove thin clouds, haze & cirrus shadows.
-var CLEAR_THRESHOLD = 0.65;
+var CLEAR_THRESHOLD = 0.8;
 var L30Bands = ["B2", "B3", "B4", "B5", "B6", "B7"];
 // Sentinel-2的B8A波段(20m)可能更适合代表近红外波段
 // var s2Bands = ["B2", "B3", "B4", "B8", "B11", "B12"];
@@ -177,12 +177,18 @@ var s1_vis = {
   max: 5,
 };
 
-var true_rgb_vis = {
+var s2_vis = {
   bands: ["Red", "Green", "Blue"],
   min: 0.0,
   max: 0.3,
 };
 
+var true_rgb_vis = {
+  bands: ["Red", "Green", "Blue"],
+  min: 0.01,
+  max: 0.15,
+};
+
 var false_rgb_vis = {
   min: 0.0,
   max: 0.4,
@@ -206,7 +212,7 @@ Map.addLayer(
   start_year + " Sentinel-2 False RGB",
   false
 );
-Map.addLayer(s2_img_rgb, true_rgb_vis, start_year + " Sentinel-2 True RGB");
+Map.addLayer(s2_img_rgb, s2_vis, start_year + " Sentinel-2 True RGB");
 Map.addLayer(region.style(styling), {}, region_name);
 
 // 导出合并后的影像