diff --git a/pkg/scheduler/api/resource_info.go b/pkg/scheduler/api/resource_info.go
index 3ed71380f75..f63ccba5bb2 100644
--- a/pkg/scheduler/api/resource_info.go
+++ b/pkg/scheduler/api/resource_info.go
@@ -389,6 +389,37 @@ func (r *Resource) LessEqual(rr *Resource, defaultValue DimensionDefaultValue) b
 	return true
 }
 
+// LessEqualResource returns "" only on condition that all dimensions of resources in r are less than or equal with that of rr,
+// Otherwise returns err string ,which show which resource is insufficient.
+// @param defaultValue "default value for resource dimension not defined in ScalarResources. Its value can only be one of 'Zero' and 'Infinity'"
+func (r *Resource) LessEqualResource(rr *Resource, defaultValue DimensionDefaultValue) string {
+	lessEqualFunc := func(l, r, diff float64) bool {
+		if l < r || math.Abs(l-r) < diff {
+			return true
+		}
+		return false
+	}
+
+	if !lessEqualFunc(r.MilliCPU, rr.MilliCPU, minResource) {
+		return Insufficient + "cpu"
+	}
+	if !lessEqualFunc(r.Memory, rr.Memory, minResource) {
+		return Insufficient + "memory"
+	}
+
+	for resourceName, leftValue := range r.ScalarResources {
+		rightValue, ok := rr.ScalarResources[resourceName]
+		if !ok && defaultValue == Infinity {
+			continue
+		}
+
+		if !lessEqualFunc(leftValue, rightValue, minResource) {
+			return Insufficient + string(resourceName)
+		}
+	}
+	return ""
+}
+
 // LessPartly returns true if there exists any dimension whose resource amount in r is less than that in rr.
 // Otherwise returns false.
 // @param defaultValue "default value for resource dimension not defined in ScalarResources. Its value can only be one of 'Zero' and 'Infinity'"
diff --git a/pkg/scheduler/api/unschedule_info.go b/pkg/scheduler/api/unschedule_info.go
index cb7dcfa890f..e1e0ebd5ad1 100644
--- a/pkg/scheduler/api/unschedule_info.go
+++ b/pkg/scheduler/api/unschedule_info.go
@@ -14,6 +14,9 @@ const (
 
 	// AllNodeUnavailableMsg is the default error message
 	AllNodeUnavailableMsg = "all nodes are unavailable"
+
+	// Insufficient mean less resource than request
+	Insufficient = "Insufficient "
 )
 
 // These are reasons for a pod's transition to a condition.