diff --git a/analyse/textrank.go b/analyse/textrank.go
index 2cbab22..ed39f02 100644
--- a/analyse/textrank.go
+++ b/analyse/textrank.go
@@ -1,6 +1,7 @@
 package analyse
 
 import (
+	"fmt"
 	mapset "github.com/deckarep/golang-set"
 	"github.com/wangbin/jiebago/posseg"
 	"math"
@@ -21,26 +22,57 @@ type edge struct {
 	weight float64
 }
 
+func (e edge) String() string {
+	return fmt.Sprintf("(%s %s): %f", e.start, e.end, e.weight)
+}
+
+type edges []edge
+
+func (es edges) Len() int {
+	return len(es)
+}
+
+func (es edges) Less(i, j int) bool {
+	return es[i].weight < es[j].weight
+}
+
+func (es edges) Swap(i, j int) {
+	es[i], es[j] = es[j], es[i]
+}
+
 type undirectWeightedGraph struct {
-	graph map[string][]edge
+	graph map[string]edges
+	keys  sort.StringSlice
+}
+
+func newUndirectWeightedGraph() *undirectWeightedGraph {
+	u := new(undirectWeightedGraph)
+	u.graph = make(map[string]edges)
+	u.keys = make(sort.StringSlice, 0)
+	return u
 }
 
 func (u *undirectWeightedGraph) addEdge(start, end string, weight float64) {
 	if _, ok := u.graph[start]; !ok {
-		u.graph[start] = []edge{edge{start: start, end: end, weight: weight}}
+		u.keys = append(u.keys, start)
+		u.graph[start] = edges{edge{start: start, end: end, weight: weight}}
 	} else {
 		u.graph[start] = append(u.graph[start], edge{start: start, end: end, weight: weight})
 	}
 
 	if _, ok := u.graph[end]; !ok {
-		u.graph[start] = []edge{edge{start: end, end: start, weight: weight}}
+		u.keys = append(u.keys, end)
+		u.graph[end] = edges{edge{start: end, end: start, weight: weight}}
 	} else {
-		u.graph[start] = append(u.graph[start], edge{start: end, end: start, weight: weight})
+		u.graph[end] = append(u.graph[end], edge{start: end, end: start, weight: weight})
 	}
-
 }
 
 func (u *undirectWeightedGraph) rank() TfIdfs {
+	if !sort.IsSorted(u.keys) {
+		sort.Sort(u.keys)
+	}
+
 	ws := make(map[string]float64)
 	outSum := make(map[string]float64)
 
@@ -48,7 +80,6 @@ func (u *undirectWeightedGraph) rank() TfIdfs {
 	if len(u.graph) > 0 {
 		wsdef /= float64(len(u.graph))
 	}
-
 	for n, out := range u.graph {
 		ws[n] = wsdef
 		sum := 0.0
@@ -59,15 +90,15 @@ func (u *undirectWeightedGraph) rank() TfIdfs {
 	}
 
 	for x := 0; x < 10; x++ {
-		for n, inedges := range u.graph {
+		for _, n := range u.keys {
 			s := 0.0
+			inedges := u.graph[n]
 			for _, e := range inedges {
-				s += e.weight / outSum[e.end] * ws[e.start]
+				s += e.weight / outSum[e.end] * ws[e.end]
 			}
 			ws[n] = (1 - DampingFactor) + DampingFactor*s
 		}
 	}
-
 	minRank := math.MaxFloat64
 	maxRank := math.SmallestNonzeroFloat64
 	for _, w := range ws {
@@ -90,13 +121,13 @@ func TextRankWithPOS(sentence string, topK int, allowPOS []string) TfIdfs {
 	for _, pos := range allowPOS {
 		posFilt.Add(pos)
 	}
-	g := new(undirectWeightedGraph)
+	g := newUndirectWeightedGraph()
 	cm := make(map[[2]string]float64)
 	span := 5
 	wordTags := posseg.Cut(sentence, true)
-	for i := range wordTags {
+	for i, _ := range wordTags {
 		if posFilt.Contains(wordTags[i].Tag) {
-			for j := i + 1; j < i+span; i++ {
+			for j := i + 1; j < i+span; j++ {
 				if j > len(wordTags) {
 					break
 				}
diff --git a/analyse/textrank_test.go b/analyse/textrank_test.go
index d8f1179..2d80587 100644
--- a/analyse/textrank_test.go
+++ b/analyse/textrank_test.go
@@ -10,20 +10,20 @@ var (
 	sentence = "此外，公司拟对全资子公司吉林欧亚置业有限公司增资4.3亿元，增资后，吉林欧亚置业注册资本由7000万元增加到5亿元。吉林欧亚置业主要经营范围为房地产开发及百货零售等业务。目前在建吉林欧亚城市商业综合体项目。2013年，实现营业收入0万元，实现净利润-139.13万元。"
 
 	tagRanks = TfIdfs{
-		TfIdf{Word: "吉林", Freq: 1.000000},
-		TfIdf{Word: "欧亚", Freq: 0.864834},
-		TfIdf{Word: "置业", Freq: 0.553466},
-		TfIdf{Word: "实现", Freq: 0.520661},
-		TfIdf{Word: "收入", Freq: 0.379700},
-		TfIdf{Word: "增资", Freq: 0.355086},
-		TfIdf{Word: "子公司", Freq: 0.349758},
-		TfIdf{Word: "全资", Freq: 0.308537},
-		TfIdf{Word: "城市", Freq: 0.306104},
-		TfIdf{Word: "商业", Freq: 0.304837},
+		TfIdf{Word: "吉林", Freq: 1.0},
+		TfIdf{Word: "欧亚", Freq: 0.87807810644},
+		TfIdf{Word: "置业", Freq: 0.562048250306},
+		TfIdf{Word: "实现", Freq: 0.520905743929},
+		TfIdf{Word: "收入", Freq: 0.384283870648},
+		TfIdf{Word: "增资", Freq: 0.360590945312},
+		TfIdf{Word: "子公司", Freq: 0.353131980904},
+		TfIdf{Word: "城市", Freq: 0.307509449283},
+		TfIdf{Word: "全资", Freq: 0.306324426665},
+		TfIdf{Word: "商业", Freq: 0.306138241063},
 	}
 )
 
-func TesTextRank(t *testing.T) {
+func TestTextRank(t *testing.T) {
 	jiebago.SetDictionary("../dict.txt")
 	SetIdf("idf.txt")