diff --git a/core/pipeline/serializer/SLSSerializer.cpp b/core/pipeline/serializer/SLSSerializer.cpp
index ebcedb710f..5e00449479 100644
--- a/core/pipeline/serializer/SLSSerializer.cpp
+++ b/core/pipeline/serializer/SLSSerializer.cpp
@@ -93,7 +93,8 @@ bool SLSEventGroupSerializer::Serialize(BatchedEvents&& group, string& res, stri
 
                 size_t contentSZ = 0;
                 contentSZ += GetLogContentSize(METRIC_RESERVED_KEY_NAME.size(), e.GetName().size());
-                contentSZ += GetLogContentSize(METRIC_RESERVED_KEY_VALUE.size(), metricEventContentCache[i].first.size());
+                contentSZ
+                    += GetLogContentSize(METRIC_RESERVED_KEY_VALUE.size(), metricEventContentCache[i].first.size());
                 contentSZ
                     += GetLogContentSize(METRIC_RESERVED_KEY_TIME_NANO.size(), e.GetTimestampNanosecond() ? 19U : 10U);
                 contentSZ += GetLogContentSize(METRIC_RESERVED_KEY_LABELS.size(), metricEventContentCache[i].second);
@@ -123,32 +124,38 @@ bool SLSEventGroupSerializer::Serialize(BatchedEvents&& group, string& res, stri
 
     static LogGroupSerializer serializer;
     serializer.Prepare(logGroupSZ);
-    for (size_t i = 0; i < group.mEvents.size(); ++i) {
-        if (group.mEvents[i].Is<LogEvent>()) {
-            const auto& logEvent = group.mEvents[i].Cast<LogEvent>();
-            serializer.StartToAddLog(logSZ[i]);
-            serializer.AddLogTime(logEvent.GetTimestamp());
-            for (const auto& kv : logEvent) {
-                serializer.AddLogContent(kv.first, kv.second);
-            }
-            if (enableNs && logEvent.GetTimestampNanosecond()) {
-                serializer.AddLogTimeNs(logEvent.GetTimestampNanosecond().value());
+    switch (eventType) {
+        case PipelineEvent::Type::LOG:
+            for (size_t i = 0; i < group.mEvents.size(); ++i) {
+                const auto& logEvent = group.mEvents[i].Cast<LogEvent>();
+                serializer.StartToAddLog(logSZ[i]);
+                serializer.AddLogTime(logEvent.GetTimestamp());
+                for (const auto& kv : logEvent) {
+                    serializer.AddLogContent(kv.first, kv.second);
+                }
+                if (enableNs && logEvent.GetTimestampNanosecond()) {
+                    serializer.AddLogTimeNs(logEvent.GetTimestampNanosecond().value());
+                }
             }
-        } else if (group.mEvents[i].Is<MetricEvent>()) {
-            const auto& metricEvent = group.mEvents[i].Cast<MetricEvent>();
-            if (metricEvent.Is<std::monostate>()) {
-                continue;
+            break;
+        case PipelineEvent::Type::METRIC:
+            for (size_t i = 0; i < group.mEvents.size(); ++i) {
+                const auto& metricEvent = group.mEvents[i].Cast<MetricEvent>();
+                if (metricEvent.Is<std::monostate>()) {
+                    continue;
+                }
+                serializer.StartToAddLog(logSZ[i]);
+                serializer.AddLogTime(metricEvent.GetTimestamp());
+                serializer.AddLogContentMetricLabel(metricEvent, metricEventContentCache[i].second);
+                serializer.AddLogContentMetricTimeNano(metricEvent);
+                serializer.AddLogContent(METRIC_RESERVED_KEY_VALUE, metricEventContentCache[i].first);
+                serializer.AddLogContent(METRIC_RESERVED_KEY_NAME, metricEvent.GetName());
             }
-            serializer.StartToAddLog(logSZ[i]);
-            serializer.AddLogTime(metricEvent.GetTimestamp());
-            serializer.AddLogContentMetricLabel(metricEvent, metricEventContentCache[i].second);
-            serializer.AddLogContentMetricTimeNano(metricEvent);
-            serializer.AddLogContent(METRIC_RESERVED_KEY_VALUE, metricEventContentCache[i].first);
-            serializer.AddLogContent(METRIC_RESERVED_KEY_NAME, metricEvent.GetName());
-        } else {
-            errorMsg = "unsupported event type in event group";
-            return false;
-        }
+            break;
+        case PipelineEvent::Type::SPAN:
+            break;
+        default:
+            break;
     }
     for (const auto& tag : group.mTags.mInner) {
         if (tag.first == LOG_RESERVED_KEY_TOPIC) {