diff --git a/GeoPulse Pipeline/GeoPulse Pipeline.csproj b/GeoPulse Pipeline/GeoPulse Pipeline.csproj
index d845a22..391d8b4 100644
--- a/GeoPulse Pipeline/GeoPulse Pipeline.csproj	
+++ b/GeoPulse Pipeline/GeoPulse Pipeline.csproj	
@@ -13,6 +13,8 @@
         <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.5" />
         <PackageReference Include="Npgsql" Version="10.0.2" />
         <PackageReference Include="Npgsql.DependencyInjection" Version="10.0.2" />
+        <PackageReference Include="Serilog.AspNetCore" Version="10.0.0" />
+        <PackageReference Include="Serilog.Sinks.Elasticsearch" Version="10.0.0" />
         <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
     </ItemGroup>
 
diff --git a/GeoPulse Pipeline/KafkaConsumer.cs b/GeoPulse Pipeline/KafkaConsumer.cs
index cd3b096..0466806 100644
--- a/GeoPulse Pipeline/KafkaConsumer.cs	
+++ b/GeoPulse Pipeline/KafkaConsumer.cs	
@@ -46,7 +46,7 @@ public class KafkaConsumer : BackgroundService
 
 		while (!stoppingToken.IsCancellationRequested)
 		{
-			try // 💡 關鍵修正：try 放在 while 裡面
+			try
 			{
 				var consumeResult = consumer.Consume(TimeSpan.FromMilliseconds(500));
 
@@ -68,7 +68,7 @@ public class KafkaConsumer : BackgroundService
 						.Select(g => new TopicPartitionOffset(g.Key, g.Last().Offset + 1)).ToList();
 					consumer.Commit(offsets);
 
-					_logger.LogInformation($"✅ [成功] 已寫入 {buffer.Count} 筆資料至 PostgreSQL。");
+					_logger.LogInformation($"Kafka已寫入DB {buffer.Count} 筆資料至 PostgreSQL。");
 
 					buffer.Clear();
 					lastBatchTime = DateTime.UtcNow;
@@ -76,14 +76,11 @@ public class KafkaConsumer : BackgroundService
 			}
 			catch (Exception ex)
 			{
-				// 💡 就算這裡噴錯，程式也只是印出 Log，然後回到 while 頂部繼續跑下一輪
-				_logger.LogError(ex, "❌ [失敗] 批次處理發生錯誤！原因: {Message}", ex.Message);
+				_logger.LogError(ex, "Kafka寫入DB批次處理發生錯誤！原因: {Message}", ex.Message);
 
-				// 發生錯誤後，為了避免壞資料卡死 buffer 導致無窮重試，這裡建議清空
 				buffer.Clear();
 				lastBatchTime = DateTime.UtcNow;
 
-				// 稍微停 2 秒，避免在連續錯誤時瘋狂刷屏
 				await Task.Delay(2000, stoppingToken);
 			}
 		}
diff --git a/GeoPulse Pipeline/Program.cs b/GeoPulse Pipeline/Program.cs
index adfd00f..9941d53 100644
--- a/GeoPulse Pipeline/Program.cs	
+++ b/GeoPulse Pipeline/Program.cs	
@@ -5,8 +5,27 @@ using Dapper;
 using GeoPulse_Pipeline;
 using Microsoft.AspNetCore.Mvc;
 using Npgsql;
+using Serilog;
+using Serilog.Sinks.Elasticsearch;
+
+Log.Logger = new LoggerConfiguration()
+	.MinimumLevel.Information()
+	.MinimumLevel.Override("Microsoft", Serilog.Events.LogEventLevel.Warning)
+	.MinimumLevel.Override("System.Data", Serilog.Events.LogEventLevel.Warning)
+	.MinimumLevel.Override("Npgsql", Serilog.Events.LogEventLevel.Warning)
+	.Enrich.FromLogContext()
+	.WriteTo.Console()
+	.WriteTo.Elasticsearch(new ElasticsearchSinkOptions(new Uri("http://192.168.0.110:9200"))
+	{
+		AutoRegisterTemplate = true,
+		AutoRegisterTemplateVersion = AutoRegisterTemplateVersion.ESv8,
+		IndexFormat = "geopulse-logs-{0:yyyy.MM.dd}",
+		InlineFields = true
+	})
+	.CreateLogger();
 
 var builder = WebApplication.CreateBuilder(args);
+builder.Host.UseSerilog();
 var kafkaHost = builder.Configuration.GetValue<string>("KafkaHost");
 var producerConfig = new ProducerConfig()
 {
@@ -37,10 +56,14 @@ app.MapPost("/api/telemetry", async (
 	[FromBody] TelemetryRequest request,
 	[FromQuery] bool useKafka,
 	IProducer<Null, string> producer,
-	IDbConnection dbConnection) =>
+	IDbConnection dbConnection,
+	ILogger<Program> logger) =>
 {
 	if (string.IsNullOrWhiteSpace(request.DeviceId))
+	{
+		logger.LogWarning("拒絕接收資料：DeviceID為空。");
 		return Results.BadRequest("Device ID is required.");
+	}
 
 	if (useKafka)
 	{
@@ -52,7 +75,7 @@ app.MapPost("/api/telemetry", async (
 		}
 		catch (ProduceException<Null, string> ex)
 		{
-			Console.WriteLine($"Kafka Delivery failed: {ex.Error.Reason}");
+			logger.LogError(ex, "Kafka 寫入失敗: {Reason}", ex.Error.Reason);
 			return Results.Problem("Kafka 寫入失敗");
 		}
 	}
@@ -68,7 +91,7 @@ app.MapPost("/api/telemetry", async (
 		}
 		catch (Exception ex)
 		{
-			Console.WriteLine($"DB Insert failed: {ex.Message}");
+			logger.LogError(ex, "資料庫直接寫入失敗: {Message}", ex.Message);
 			return Results.Problem("資料庫寫入失敗");
 		}
 	}