diff --git a/jaeger.go b/jaeger.go
index a9dd537..7db3fad 100644
--- a/jaeger.go
+++ b/jaeger.go
@@ -48,7 +48,11 @@ func BeforeHandel(ctx context.Context, baseName, serviceName, serviceMethod stri
 		span.AddEvent(fmt.Sprintf("调用rpc服务:%s,%s,%s", baseName, serviceName, serviceMethod))
 		spanCtx := ctx.Value(CtxSpanCtxName).(context.Context)
 		meta := ctx.Value(share.ReqMetaDataKey)
-		spanCtx = context.WithValue(spanCtx, share.ReqMetaDataKey, meta)
+		if meta == nil {
+			spanCtx = context.WithValue(spanCtx, share.ReqMetaDataKey, map[string]string{})
+		} else {
+			spanCtx = context.WithValue(spanCtx, share.ReqMetaDataKey, meta)
+		}
 		share2.Inject(spanCtx, otel.GetTextMapPropagator())
 		ctx = spanCtx
 	}