diff --git a/src/middlewares/SimApiRequestLogMiddleware.cj b/src/middlewares/SimApiRequestLogMiddleware.cj
index 47e4431..2feb55f 100644
--- a/src/middlewares/SimApiRequestLogMiddleware.cj
+++ b/src/middlewares/SimApiRequestLogMiddleware.cj
@@ -8,14 +8,21 @@ package simapi.middlewares
 import std.collection.*
 import std.io.*
 import std.time.*
+import stdx.encoding.json.*
 import soulsoft_web_http.*
 import soulsoft_extensions_logging.*
 import simapi.communications.*
 import simapi.configurations.*
 
 /**
- * 请求日志中间件：记录请求方法、URL、请求头、请求体、响应状态码与耗时。
+ * 请求日志中间件：记录请求方法、URL、请求头、请求体、响应状态码、耗时与异常。
  * 对应 C# 的 SimApi.Middlewares.SimApiRequestLogMiddleware。
+ *
+ * 对齐说明：
+ *   - 请求体按 JSON 字段级截断（对齐 C#：仅对超长字符串字段截断，保留结构）
+ *   - 捕获下游异常并记录，随后重抛（对齐 C# ExceptionDispatchInfo + edi.Throw）
+ *   - 响应体：soulsoft HttpResponse.body 只读不可替换（C# 用 MemoryStream 替换捕获），
+ *     此处以 Content-Length 作为替代信息；ShowFullResponse 选项因此暂不生效
  */
 public class SimApiRequestLogMiddleware <: IMiddleware {
     private let _options: SimApiOptions
@@ -51,15 +58,33 @@ public class SimApiRequestLogMiddleware <: IMiddleware {
         sb.append("*( RequestBody ) =>\n")
         sb.append(readRequestBody(context))
 
-        // 调用下一级
-        next(context)
+        // 调用下一级，捕获异常以便记录并重抛（对齐 C# ExceptionDispatchInfo）
+        var exception: ?Exception = None
+        try {
+            next(context)
+        } catch (ex: Exception) {
+            exception = Some(ex)
+        }
 
         // 响应信息
         let elapsed = MonoTime.now() - start
         let elapsedMs = elapsed / Duration.millisecond
-        sb.append("*( Response [${context.response.statusCode}] ) => ${elapsedMs}ms\n")
+        sb.append("*( Response [${context.response.statusCode}] ) => ${elapsedMs}ms")
+        // 响应体捕获受 soulsoft 限制（body 只读不可替换），记录 Content-Length 作为替代
+        if (let Some(len) <- context.response.contentLength) {
+            sb.append("  (响应体长度: ${len})")
+        }
+        sb.append("\n")
+        if (let Some(ex) <- exception) {
+            sb.append("Exception: ${ex.toString()}\n")
+        }
 
         _logger.info(sb.toString())
+
+        // 重抛原异常（对齐 C# edi?.Throw()），由外层 ExceptionMiddleware 处理
+        if (let Some(ex) <- exception) {
+            throw ex
+        }
     }
 
     private func serializeHeaders(context: HttpContext): String {
@@ -107,17 +132,39 @@ public class SimApiRequestLogMiddleware <: IMiddleware {
         }
     }
 
+    /// 请求体截断：JSON 字段级截断（对齐 C#：仅对超长字符串字段截断），非 JSON 则整串截断
     private func truncateBody(body: String): String {
-        if (_options.simApiRequestLogOptions.requestStringLogLength <= 0 ||
-            body.size <= _options.simApiRequestLogOptions.requestStringLogLength) {
+        let maxLen = _options.simApiRequestLogOptions.requestStringLogLength
+        if (maxLen <= 0) {
             return body + "\n"
         }
-        // 简单按长度截断（不做 JSON 字段级截断，保持实现简洁）
-        let chars = body.toArray()
-        var sb = StringBuilder()
-        for (i in 0.._options.simApiRequestLogOptions.requestStringLogLength) {
-            sb.append(chars[i])
+        try {
+            let jv = JsonValue.fromStr(body)
+            match (jv.kind()) {
+                case JsObject =>
+                    let obj = jv.asObject()
+                    let newObj = JsonObject()
+                    for ((k, v) in obj.getFields()) {
+                        match (v.kind()) {
+                            case JsString =>
+                                let str = v.asString().getValue()
+                                if (str.size > maxLen) {
+                                    newObj.put(k, JsonString(str[0..maxLen] + "...(${str.size})"))
+                                } else {
+                                    newObj.put(k, v)
+                                }
+                            case _ => newObj.put(k, v)
+                        }
+                    }
+                    return newObj.toString() + "\n"
+                case _ => ()
+            }
+        } catch (_: Exception) {
         }
-        return "${sb.toString()}...(${body.size})\n"
+        // 非 JSON 或解析失败：整串按长度截断
+        if (body.size <= maxLen) {
+            return body + "\n"
+        }
+        return body[0..maxLen] + "...(${body.size})\n"
     }
 }