diff --git a/relay/channel/aws/dto.go b/relay/channel/aws/dto.go
index 5bf3551..9f4221a 100644
--- a/relay/channel/aws/dto.go
+++ b/relay/channel/aws/dto.go
@@ -7,9 +7,9 @@ import (
 type AwsClaudeRequest struct {
 	// AnthropicVersion should be "bedrock-2023-05-31"
 	AnthropicVersion string                 `json:"anthropic_version"`
-	System           string                 `json:"system"`
+	System           string                 `json:"system,omitempty"`
 	Messages         []claude.ClaudeMessage `json:"messages"`
-	MaxTokens        int                    `json:"max_tokens,omitempty"`
+	MaxTokens        uint                   `json:"max_tokens,omitempty"`
 	Temperature      float64                `json:"temperature,omitempty"`
 	TopP             float64                `json:"top_p,omitempty"`
 	TopK             int                    `json:"top_k,omitempty"`
@@ -17,3 +17,18 @@ type AwsClaudeRequest struct {
 	Tools            []claude.Tool          `json:"tools,omitempty"`
 	ToolChoice       any                    `json:"tool_choice,omitempty"`
 }
+
+func copyRequest(req *claude.ClaudeRequest) *AwsClaudeRequest {
+	return &AwsClaudeRequest{
+		AnthropicVersion: "bedrock-2023-05-31",
+		System:           req.System,
+		Messages:         req.Messages,
+		MaxTokens:        req.MaxTokens,
+		Temperature:      req.Temperature,
+		TopP:             req.TopP,
+		TopK:             req.TopK,
+		StopSequences:    req.StopSequences,
+		Tools:            req.Tools,
+		ToolChoice:       req.ToolChoice,
+	}
+}
diff --git a/relay/channel/aws/relay-aws.go b/relay/channel/aws/relay-aws.go
index 748a84e..1b0882b 100644
--- a/relay/channel/aws/relay-aws.go
+++ b/relay/channel/aws/relay-aws.go
@@ -5,7 +5,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"github.com/gin-gonic/gin"
-	"github.com/jinzhu/copier"
 	"github.com/pkg/errors"
 	"io"
 	"net/http"
@@ -78,13 +77,7 @@ func awsHandler(c *gin.Context, info *relaycommon.RelayInfo, requestMode int) (*
 		return wrapErr(errors.New("request not found")), nil
 	}
 	claudeReq := claudeReq_.(*claude.ClaudeRequest)
-	awsClaudeReq := &AwsClaudeRequest{
-		AnthropicVersion: "bedrock-2023-05-31",
-	}
-	if err = copier.Copy(awsClaudeReq, claudeReq); err != nil {
-		return wrapErr(errors.Wrap(err, "copy request")), nil
-	}
-
+	awsClaudeReq := copyRequest(claudeReq)
 	awsReq.Body, err = json.Marshal(awsClaudeReq)
 	if err != nil {
 		return wrapErr(errors.Wrap(err, "marshal request")), nil
@@ -136,12 +129,7 @@ func awsStreamHandler(c *gin.Context, resp *http.Response, info *relaycommon.Rel
 	}
 	claudeReq := claudeReq_.(*claude.ClaudeRequest)
 
-	awsClaudeReq := &AwsClaudeRequest{
-		AnthropicVersion: "bedrock-2023-05-31",
-	}
-	if err = copier.Copy(awsClaudeReq, claudeReq); err != nil {
-		return wrapErr(errors.Wrap(err, "copy request")), nil
-	}
+	awsClaudeReq := copyRequest(claudeReq)
 	awsReq.Body, err = json.Marshal(awsClaudeReq)
 	if err != nil {
 		return wrapErr(errors.Wrap(err, "marshal request")), nil