diff --git a/cmd/web.go b/cmd/web.go
index c343566d..d2b148d7 100644
--- a/cmd/web.go
+++ b/cmd/web.go
@@ -188,7 +188,8 @@ func runWeb(*cli.Context) {
 		r.Get("/issues/milestones", repo.Milestones)
 		r.Get("/issues/milestones/new", repo.NewMilestone)
 		r.Post("/issues/milestones/new", bindIgnErr(auth.CreateMilestoneForm{}), repo.NewMilestonePost)
-		r.Get("/issues/milestones/edit", repo.UpdateMilestones)
+		r.Get("/issues/milestones/:index/edit", repo.UpdateMilestone)
+		r.Post("/issues/milestones/:index/edit", bindIgnErr(auth.CreateMilestoneForm{}), repo.UpdateMilestonePost)
 		r.Post("/comment/:action", repo.Comment)
 		r.Get("/releases/new", repo.ReleasesNew)
 	}, reqSignIn, middleware.RepoAssignment(true))
diff --git a/models/issue.go b/models/issue.go
index fa9d9427..213fd1f2 100644
--- a/models/issue.go
+++ b/models/issue.go
@@ -14,7 +14,8 @@ import (
 )
 
 var (
-	ErrIssueNotExist = errors.New("Issue does not exist")
+	ErrIssueNotExist     = errors.New("Issue does not exist")
+	ErrMilestoneNotExist = errors.New("Milestone does not exist")
 )
 
 // Issue represents an issue or pull request of repository.
@@ -412,6 +413,7 @@ type Milestone struct {
 	NumOpenIssues   int `xorm:"-"`
 	Completeness    int // Percentage(1-100).
 	Deadline        time.Time
+	DeadlineString  string `xorm:"-"`
 	ClosedDate      time.Time
 }
 
@@ -441,6 +443,18 @@ func NewMilestone(m *Milestone) (err error) {
 	return sess.Commit()
 }
 
+// GetMilestoneByIndex returns the milestone of given repository and index.
+func GetMilestoneByIndex(repoId, idx int64) (*Milestone, error) {
+	m := &Milestone{RepoId: repoId, Index: idx}
+	has, err := orm.Get(m)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrMilestoneNotExist
+	}
+	return m, nil
+}
+
 // GetMilestones returns a list of milestones of given repository and status.
 func GetMilestones(repoId int64, isClosed bool) ([]*Milestone, error) {
 	miles := make([]*Milestone, 0, 10)
@@ -448,6 +462,12 @@ func GetMilestones(repoId int64, isClosed bool) ([]*Milestone, error) {
 	return miles, err
 }
 
+// UpdateMilestone updates information of given milestone.
+func UpdateMilestone(m *Milestone) error {
+	_, err := orm.Id(m.Id).Update(m)
+	return err
+}
+
 // Issue types.
 const (
 	IT_PLAIN  = iota // Pure comment.
diff --git a/routers/repo/issue.go b/routers/repo/issue.go
index 2958d8eb..38a971a0 100644
--- a/routers/repo/issue.go
+++ b/routers/repo/issue.go
@@ -524,23 +524,22 @@ func NewMilestonePost(ctx *middleware.Context, form auth.CreateMilestoneForm) {
 	var deadline time.Time
 	var err error
 	if len(form.Deadline) == 0 {
-		deadline = time.Now().AddDate(100, 0, 0)
-	} else {
-		deadline, err = time.Parse("01/02/2006", form.Deadline)
-		if err != nil {
-			ctx.Handle(500, "issue.NewMilestonePost(time.Parse)", err)
-			return
-		}
+		form.Deadline = "12/31/9999"
+	}
+	deadline, err = time.Parse("01/02/2006", form.Deadline)
+	if err != nil {
+		ctx.Handle(500, "issue.NewMilestonePost(time.Parse)", err)
+		return
 	}
 
-	m := &models.Milestone{
+	mile := &models.Milestone{
 		RepoId:   ctx.Repo.Repository.Id,
 		Index:    int64(ctx.Repo.Repository.NumMilestones) + 1,
 		Name:     form.Title,
 		Content:  form.Content,
 		Deadline: deadline,
 	}
-	if err = models.NewMilestone(m); err != nil {
+	if err = models.NewMilestone(mile); err != nil {
 		ctx.Handle(500, "issue.NewMilestonePost(NewMilestone)", err)
 		return
 	}
@@ -548,10 +547,73 @@ func NewMilestonePost(ctx *middleware.Context, form auth.CreateMilestoneForm) {
 	ctx.Redirect(ctx.Repo.RepoLink + "/issues/milestones")
 }
 
-func UpdateMilestones(ctx *middleware.Context) {
-	ctx.Data["Title"] = "Update Milestones"
+func UpdateMilestone(ctx *middleware.Context, params martini.Params) {
+	ctx.Data["Title"] = "Update Milestone"
 	ctx.Data["IsRepoToolbarIssues"] = true
 	ctx.Data["IsRepoToolbarIssuesList"] = true
 
+	idx, _ := base.StrTo(params["index"]).Int64()
+	if idx == 0 {
+		ctx.Handle(404, "issue.UpdateMilestone", nil)
+		return
+	}
+
+	mile, err := models.GetMilestoneByIndex(ctx.Repo.Repository.Id, idx)
+	if err != nil {
+		if err == models.ErrMilestoneNotExist {
+			ctx.Handle(404, "issue.UpdateMilestone(GetMilestoneByIndex)", err)
+		} else {
+			ctx.Handle(500, "issue.UpdateMilestone(GetMilestoneByIndex)", err)
+		}
+		return
+	}
+	mile.DeadlineString = mile.Deadline.UTC().Format("01/02/2006")
+	if mile.DeadlineString == "12/31/9999" {
+		mile.DeadlineString = ""
+	}
+	ctx.Data["Milestone"] = mile
+
 	ctx.HTML(200, "issue/milestone_edit")
 }
+
+func UpdateMilestonePost(ctx *middleware.Context, params martini.Params, form auth.CreateMilestoneForm) {
+	ctx.Data["Title"] = "Update Milestone"
+	ctx.Data["IsRepoToolbarIssues"] = true
+	ctx.Data["IsRepoToolbarIssuesList"] = true
+
+	idx, _ := base.StrTo(params["index"]).Int64()
+	if idx == 0 {
+		ctx.Handle(404, "issue.UpdateMilestone", nil)
+		return
+	}
+
+	mile, err := models.GetMilestoneByIndex(ctx.Repo.Repository.Id, idx)
+	if err != nil {
+		if err == models.ErrMilestoneNotExist {
+			ctx.Handle(404, "issue.UpdateMilestone(GetMilestoneByIndex)", err)
+		} else {
+			ctx.Handle(500, "issue.UpdateMilestone(GetMilestoneByIndex)", err)
+		}
+		return
+	}
+
+	var deadline time.Time
+	if len(form.Deadline) == 0 {
+		form.Deadline = "12/31/9999"
+	}
+	deadline, err = time.Parse("01/02/2006", form.Deadline)
+	if err != nil {
+		ctx.Handle(500, "issue.UpdateMilestonePost(time.Parse)", err)
+		return
+	}
+
+	mile.Name = form.Title
+	mile.Content = form.Content
+	mile.Deadline = deadline
+	if err = models.UpdateMilestone(mile); err != nil {
+		ctx.Handle(500, "issue.UpdateMilestonePost(UpdateMilestone)", err)
+		return
+	}
+
+	ctx.Redirect(ctx.Repo.RepoLink + "/issues/milestones")
+}
diff --git a/templates/issue/milestone.tmpl b/templates/issue/milestone.tmpl
index 3c2cf93a..e15d9641 100644
--- a/templates/issue/milestone.tmpl
+++ b/templates/issue/milestone.tmpl
@@ -22,7 +22,7 @@
                     <span class="issue-open label label-success">{{.NumClosedIssues}}</span>
                     <span class="issue-close label label-warning">{{.NumOpenIssues}}</span>
                     <p class="actions pull-right">
-                        <!-- <a href="{{$.RepoLink}}/issues/milestones/{{.Index}}/edit">Edit</a> -->
+                        <a href="{{$.RepoLink}}/issues/milestones/{{.Index}}/edit">Edit</a>
                         <!-- <a href="#">Open</a>
                         <a href="#">Close</a> -->
                         <!-- <a class="text-danger" href="#">Delete</a> -->
diff --git a/templates/issue/milestone_edit.tmpl b/templates/issue/milestone_edit.tmpl
index 2db55ae9..8f1a05e0 100644
--- a/templates/issue/milestone_edit.tmpl
+++ b/templates/issue/milestone_edit.tmpl
@@ -4,7 +4,7 @@
 {{template "repo/toolbar" .}}
 <div id="body" class="container">
     <div id="issue">
-        <form class="form" action="{{.RepoLink}}/issues/milestones/new" method="post" id="issue-create-form">
+        <form class="form" action="{{.RepoLink}}/issues/milestones/{{.Milestone.Index}}/edit" method="post" id="issue-create-form">
             {{.CsrfTokenHtml}}
             {{template "base/alert" .}}
             <div class="col-md-1">
@@ -12,7 +12,7 @@
             </div>
             <div class="col-md-8 panel panel-default">
                 <div class="form-group panel-body">
-                    <input class="form-control input-lg" type="text" name="title" required="required" placeholder="Title" value="{{.title}}" />
+                    <input class="form-control input-lg" type="text" name="title" required="required" placeholder="Title" value="{{.Milestone.Name}}" />
                 </div>
                 <div class="form-group panel-body">
                     <div class="md-help pull-right"><!-- todo help link -->
@@ -25,7 +25,7 @@
                     <div class="tab-content">
                         <div class="tab-pane" id="issue-textarea">
                             <div class="form-group">
-                                <textarea class="form-control" name="content" id="issue-content" rows="10" placeholder="Write some content" data-ajax-rel="issue-preview" data-ajax-val="val" data-ajax-field="text">{{.content}}</textarea>
+                                <textarea class="form-control" name="content" id="issue-content" rows="10" placeholder="Write some content" data-ajax-rel="issue-preview" data-ajax-val="val" data-ajax-field="text">{{.Milestone.Content}}</textarea>
                             </div>
                         </div>
                         <div class="tab-pane issue-preview-content" id="issue-preview">loading...</div>
@@ -34,15 +34,14 @@
                 <div class="text-right panel-body">
                     <div class="form-group">
                         <input type="hidden" value="id" name="repo-id"/>
-                        <button class="btn-success btn">Create new issue</button>
+                        <button class="btn-success btn">Update milestone</button>
                     </div>
                 </div>
             </div>
             <div class="col-md-3">
                 <h4>Milestone Due Date</h4>
-
                 <div class="form-group">
-                    <input name="due_date" type="text" class="form-control" id="milestone-due-date">
+                    <input name="due_date" type="text" class="form-control" id="milestone-due-date" value="{{.Milestone.DeadlineString}}">
                 </div>
             </div>
         </form>