diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/filter/impl/ProcessCostTimeFilter.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/filter/impl/ProcessCostTimeFilter.java
index cd1190dfe..fcca43874 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/filter/impl/ProcessCostTimeFilter.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/filter/impl/ProcessCostTimeFilter.java
@@ -6,31 +6,35 @@ import com.ai.cloud.skywalking.analysis.model.CostMap;
 import com.ai.cloud.skywalking.analysis.model.SpanEntry;
 
 public class ProcessCostTimeFilter extends SpanNodeProcessFilter {
-    @Override
-    public void doFilter(SpanEntry spanEntry, ChainNode node, CostMap costMap) {
-        long subNodeCost = spanEntry.getCost();
-        node.setCost(spanEntry.getCost());
+	@Override
+	public void doFilter(SpanEntry spanEntry, ChainNode node, CostMap costMap) {
+		node.setCost(spanEntry.getCost());
+		
+		this.saveCostAsSubNodeCost(spanEntry, node, costMap);
+		this.computeChainNodeCost(costMap, node);
 
-        if (costMap.exists(spanEntry.getParentLevelId())) {
-            subNodeCost += costMap.get(spanEntry.getParentLevelId());
-        }
+		this.doNext(spanEntry, node, costMap);
+	}
 
-        costMap.put(spanEntry.getParentLevelId(), subNodeCost);
-        
-        this.computeChainNodeCost(costMap, node);
+	private void saveCostAsSubNodeCost(SpanEntry spanEntry, ChainNode node,
+			CostMap costMap) {
+		long subNodeCost = spanEntry.getCost();
+		if (costMap.exists(spanEntry.getParentLevelId())) {
+			subNodeCost += costMap.get(spanEntry.getParentLevelId());
+		}
 
-        this.doNext(spanEntry, node, costMap);
-    }
-    
-    private void computeChainNodeCost(CostMap costMap, ChainNode node) {
-        String levelId = node.getParentLevelId();
-        if (levelId != null && levelId.length() > 0) {
-            levelId += ".";
-        }
-        levelId += node.getLevelId() + "";
+		costMap.put(spanEntry.getParentLevelId(), subNodeCost);
+	}
 
-        if (costMap.exists(levelId)) {
-            node.setCost(node.getCost() - costMap.get(levelId));
-        }
-    }
+	private void computeChainNodeCost(CostMap costMap, ChainNode node) {
+		String levelId = node.getParentLevelId();
+		if (levelId != null && levelId.length() > 0) {
+			levelId += ".";
+		}
+		levelId += node.getLevelId() + "";
+
+		if (costMap.exists(levelId)) {
+			node.setCost(node.getCost() - costMap.get(levelId));
+		}
+	}
 }