diff --git a/configs/milvus.yaml b/configs/milvus.yaml
index fdd7078edc..55cebd318e 100644
--- a/configs/milvus.yaml
+++ b/configs/milvus.yaml
@@ -644,8 +644,8 @@ dataCoord:
     clusteringCompactionUsage: 16 # slot usage of clustering compaction job.
     mixCompactionUsage: 8 # slot usage of mix compaction job.
     l0DeleteCompactionUsage: 8 # slot usage of l0 compaction job.
-    indexTaskSlotUsage: 256 # slot usage of index task
-    statsTaskSlotUsage: 8 # slot usage of stats task
+    indexTaskSlotUsage: 64 # slot usage of index task per 512mb
+    statsTaskSlotUsage: 8 # slot usage of stats task per 512mb
     analyzeTaskSlotUsage: 65535 # slot usage of analyze task
   jsonStatsTriggerCount: 10 # jsonkey stats task count per trigger
   jsonStatsTriggerInterval: 10 # jsonkey task interval per trigger
diff --git a/internal/datacoord/util.go b/internal/datacoord/util.go
index 251c678945..1b46c78ef3 100644
--- a/internal/datacoord/util.go
+++ b/internal/datacoord/util.go
@@ -365,25 +365,27 @@ func getSortStatus(sorted bool) string {
 }
 
 func calculateIndexTaskSlot(segmentSize int64) int64 {
-	if segmentSize > 1000*1024*1024 {
-		return max(Params.DataCoordCfg.IndexTaskSlotUsage.GetAsInt64(), 1)
-	} else if segmentSize > 500*1024*1024 {
-		return max(Params.DataCoordCfg.IndexTaskSlotUsage.GetAsInt64()/4, 1)
+	defaultSlots := Params.DataCoordCfg.IndexTaskSlotUsage.GetAsInt64()
+	if segmentSize > 512*1024*1024 {
+		taskSlot := max(segmentSize/512/1024/1024, 1) * defaultSlots
+		return max(taskSlot, 1)
 	} else if segmentSize > 100*1024*1024 {
-		return max(Params.DataCoordCfg.IndexTaskSlotUsage.GetAsInt64()/16, 1)
+		return max(defaultSlots/4, 1)
 	} else if segmentSize > 10*1024*1024 {
-		return max(Params.DataCoordCfg.IndexTaskSlotUsage.GetAsInt64()/64, 1)
+		return max(defaultSlots/16, 1)
 	}
-	return max(Params.DataCoordCfg.IndexTaskSlotUsage.GetAsInt64()/256, 1)
+	return max(defaultSlots/64, 1)
 }
 
 func calculateStatsTaskSlot(segmentSize int64) int64 {
-	if segmentSize > 500*1024*1024 {
-		return max(Params.DataCoordCfg.StatsTaskSlotUsage.GetAsInt64(), 1)
+	defaultSlots := Params.DataCoordCfg.StatsTaskSlotUsage.GetAsInt64()
+	if segmentSize > 512*1024*1024 {
+		taskSlot := max(segmentSize/512/1024/1024, 1) * defaultSlots
+		return max(taskSlot, 1)
 	} else if segmentSize > 100*1024*1024 {
-		return max(Params.DataCoordCfg.StatsTaskSlotUsage.GetAsInt64()/2, 1)
+		return max(defaultSlots/2, 1)
 	} else if segmentSize > 10*1024*1024 {
-		return max(Params.DataCoordCfg.StatsTaskSlotUsage.GetAsInt64()/4, 1)
+		return max(defaultSlots/4, 1)
 	}
-	return max(Params.DataCoordCfg.StatsTaskSlotUsage.GetAsInt64()/8, 1)
+	return max(defaultSlots/8, 1)
 }
diff --git a/pkg/util/paramtable/component_param.go b/pkg/util/paramtable/component_param.go
index 3680a5c68d..bb89c21ce9 100644
--- a/pkg/util/paramtable/component_param.go
+++ b/pkg/util/paramtable/component_param.go
@@ -4471,8 +4471,8 @@ During compaction, the size of segment # of rows is able to exceed segment max #
 	p.IndexTaskSlotUsage = ParamItem{
 		Key:          "dataCoord.slot.indexTaskSlotUsage",
 		Version:      "2.5.8",
-		Doc:          "slot usage of index task",
-		DefaultValue: "256",
+		Doc:          "slot usage of index task per 512mb",
+		DefaultValue: "64",
 		PanicIfEmpty: false,
 		Export:       true,
 	}
@@ -4481,7 +4481,7 @@ During compaction, the size of segment # of rows is able to exceed segment max #
 	p.StatsTaskSlotUsage = ParamItem{
 		Key:          "dataCoord.slot.statsTaskSlotUsage",
 		Version:      "2.5.8",
-		Doc:          "slot usage of stats task",
+		Doc:          "slot usage of stats task per 512mb",
 		DefaultValue: "8",
 		PanicIfEmpty: false,
 		Export:       true,