diff --git a/src/main/java/com/profiler/common/bo/SpanBo.java b/src/main/java/com/profiler/common/bo/SpanBo.java
index d572fa69f..36c50b7a0 100644
--- a/src/main/java/com/profiler/common/bo/SpanBo.java
+++ b/src/main/java/com/profiler/common/bo/SpanBo.java
@@ -314,6 +314,6 @@ public class SpanBo {
 
     @Override
     public String toString() {
-        return "SpanBo{" + "agentId='" + agentId + '\'' + ", startTime=" + startTime + ", elapsed=" + elapsed + ", mostTraceId=" + mostTraceId + ", leastTraceId=" + leastTraceId + ", rpc='" + rpc + '\'' + ", serviceName='" + serviceName + '\'' + ", spanID=" + spanId + ", parentSpanId=" + parentSpanId + ", flag=" + flag + ", endPoint='" + endPoint + ", serviceType=" + serviceType + "}";
+		return "SpanBo{" + "agentId='" + agentId + '\'' + ", startTime=" + startTime + ", elapsed=" + elapsed + ", mostTraceId=" + mostTraceId + ", leastTraceId=" + leastTraceId + ", rpc='" + rpc + '\'' + ", serviceName='" + serviceName + '\'' + ", spanID=" + spanId + ", parentSpanId=" + parentSpanId + ", flag=" + flag + ", endPoint='" + endPoint + ", serviceType=" + serviceType + ", subSpans=" + subSpanList + "}";
     }
 }
\ No newline at end of file