diff --git a/backend/internal/proxy/repo/proxy.go b/backend/internal/proxy/repo/proxy.go
index 532e91d..e146a6d 100644
--- a/backend/internal/proxy/repo/proxy.go
+++ b/backend/internal/proxy/repo/proxy.go
@@ -203,6 +203,14 @@ func (r *ProxyRepo) AcceptCompletion(ctx context.Context, req *domain.AcceptComp
 	})
 }
 
+// abs 返回整数的绝对值
+func abs(x int64) int64 {
+	if x < 0 {
+		return -x
+	}
+	return x
+}
+
 func (r *ProxyRepo) Report(ctx context.Context, req *domain.ReportReq) error {
 	return entx.WithTx(ctx, r.db, func(tx *db.Tx) error {
 		rc, err := tx.Task.Query().Where(task.TaskID(req.ID)).Only(ctx)
@@ -235,6 +243,11 @@ func (r *ProxyRepo) Report(ctx context.Context, req *domain.ReportReq) error {
 				Where(taskrecord.TaskID(rc.ID)).
 				SetCompletion(req.Content).Exec(ctx)
 
+		case consts.ReportActionReject:
+			if err := r.handleRejectCompletion(ctx, tx, rc, req); err != nil {
+				return err
+			}
+
 		case consts.ReportActionFileWritten:
 			if err := r.handleFileWritten(ctx, tx, rc, req); err != nil {
 				return err
@@ -245,6 +258,41 @@ func (r *ProxyRepo) Report(ctx context.Context, req *domain.ReportReq) error {
 	})
 }
 
+func (r *ProxyRepo) handleRejectCompletion(ctx context.Context, tx *db.Tx, rc *db.Task, req *domain.ReportReq) error {
+	// 检测用户是否在同样的光标位置输入了新代码
+	// 1. 检查光标位置是否匹配
+	// 2. 检查源代码是否发生了变化
+	// 3. 只有在检测到变化时才记录用户输入
+
+	shouldRecord := false
+
+	// 检查光标位置是否匹配（允许小的误差）
+	if req.CursorPosition > 0 && rc.CursorPosition > 0 {
+		positionDiff := abs(req.CursorPosition - rc.CursorPosition)
+		if positionDiff <= 10 { // 允许10个字符的误差
+			shouldRecord = true
+		}
+	}
+
+	// 检查源代码是否发生了变化
+	if req.SourceCode != "" && rc.SourceCode != "" {
+		if req.SourceCode != rc.SourceCode {
+			shouldRecord = true
+		}
+	}
+
+	// 如果检测到变化，记录用户输入
+	if shouldRecord && req.UserInput != "" {
+		if err := tx.Task.UpdateOneID(rc.ID).
+			SetUserInput(req.UserInput).
+			Exec(ctx); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
 func (r *ProxyRepo) handleFileWritten(ctx context.Context, tx *db.Tx, rc *db.Task, req *domain.ReportReq) error {
 	lineCount := 0
 	switch req.Tool {