diff --git a/.gitignore b/.gitignore
index 92b579f2..07372407 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 gogs
 *.exe
 *.exe~
-.DS_Store
\ No newline at end of file
+.DS_Store
+*.db
diff --git a/models/models.go b/models/models.go
index d5a8c8cf..bddece47 100644
--- a/models/models.go
+++ b/models/models.go
@@ -5,67 +5,42 @@
 package models
 
 import (
-	"os"
-	"path/filepath"
+	"time"
+
 	"github.com/lunny/xorm"
-
-	git "github.com/libgit2/git2go"
 )
 
-const (
-	UserRepo = iota
-	OrgRepo
+var (
+	// orm
+	orm *xorm.Engine
+	// repository root path
+	root string
 )
 
-type User struct {
-	Id   int64
-	Name string `xorm:"unique"`
+type PublicKey struct {
+	Id      int64
+	Name    string    `xorm:"unique not null"`
+	Content string    `xorm:"text not null"`
+	Created time.Time `xorm:"created"`
+	Updated time.Time `xorm:"updated"`
 }
 
-type Org struct {
+type Members struct {
+	Id     int64
+	OrgId  int64 `xorm:"unique(s) index"`
+	UserId int64 `xorm:"unique(s)"`
+}
+
+type Issue struct {
+	Id       int64
+	RepoId   int64 `xorm:"index"`
+	PosterId int64
+}
+
+type PullRequest struct {
 	Id int64
 }
 
-type Repo struct {
-	Id      int64
-	OwnerId int64  `xorm:"unique(s)"`
-	Type    int    `xorm:"unique(s)"`
-	Name    string `xorm:"unique(s)"`
-}
-
-var (
-	orm *xorm.Engine
-)
-
-//
-// create a repository for a user or orgnaziation
-//
-func CreateUserRepository(root string, user *User, reposName string) error {
-	p := filepath.Join(root, user.Name)
-	os.MkdirAll(p, os.ModePerm)
-	f := filepath.Join(p, reposName)
-	_, err := git.InitRepository(f, false)
-	if err != nil {
-		return err
-	}
-
-	repo := Repo{OwnerId: user.Id, Type: UserRepo, Name: reposName}
-	_, err = orm.Insert(&repo)
-	if err != nil {
-		os.RemoveAll(f)
-	}
-	return err
-}
-
-//
-// delete a repository for a user or orgnaztion
-//
-func DeleteUserRepository(root string, user *User, reposName string) error {
-	err := os.RemoveAll(filepath.Join(root, user.Name, reposName))
-	if err != nil {
-		return err
-	}
-
-	_, err = orm.Delete(&Repo{OwnerId: user.Id, Type: UserRepo, Name: reposName})
-	return err
+type Comment struct {
+	Id int64
 }
diff --git a/models/models_test.go b/models/models_test.go
index 80653d57..f4a40ff3 100644
--- a/models/models_test.go
+++ b/models/models_test.go
@@ -15,15 +15,28 @@ func init() {
 		fmt.Println(err)
 	}
 
-	err = orm.Sync(&User{}, &Org{}, &Repo{})
+	orm.ShowSQL = true
+	orm.ShowDebug = true
+
+	err = orm.Sync(&User{}, &Repo{})
 	if err != nil {
 		fmt.Println(err)
 	}
+
+	root = "test"
 }
 
 func TestCreateRepository(t *testing.T) {
-	user := User{Id: 1}
-	err := CreateUserRepository("test", &user, "test")
+	user := User{Id: 1, Type: Individual}
+	_, err := CreateRepository(&user, "test")
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+func TestDeleteRepository(t *testing.T) {
+	user := User{Id: 1, Type: Individual}
+	err := DeleteRepository(&user, "test")
 	if err != nil {
 		t.Error(err)
 	}
diff --git a/models/repo.go b/models/repo.go
new file mode 100644
index 00000000..8e3aae9a
--- /dev/null
+++ b/models/repo.go
@@ -0,0 +1,119 @@
+package models
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
+	git "github.com/libgit2/git2go"
+)
+
+type Repo struct {
+	Id        int64
+	OwnerId   int64 `xorm:"unique(s)"`
+	ForkId    int64
+	LowerName string `xorm:"unique(s) index not null"`
+	Name      string `xorm:"index not null"`
+	NumWatchs int
+	NumStars  int
+	NumForks  int
+	Created   time.Time `xorm:"created"`
+	Updated   time.Time `xorm:"updated"`
+}
+
+// check if repository is exist
+func IsRepositoryExist(user *User, reposName string) (bool, error) {
+	repo := Repo{OwnerId: user.Id}
+	// TODO: get repository by nocase name
+	return orm.Where("lower_name = ?", strings.ToLower(reposName)).Get(&repo)
+}
+
+//
+// create a repository for a user or orgnaziation
+//
+func CreateRepository(user *User, reposName string) (*Repo, error) {
+	p := filepath.Join(root, user.Name)
+	os.MkdirAll(p, os.ModePerm)
+	f := filepath.Join(p, reposName)
+	_, err := git.InitRepository(f, false)
+	if err != nil {
+		return nil, err
+	}
+
+	repo := Repo{OwnerId: user.Id, Name: reposName}
+	session := orm.NewSession()
+	defer session.Close()
+	session.Begin()
+	_, err = session.Insert(&repo)
+	if err != nil {
+		os.RemoveAll(f)
+		session.Rollback()
+		return nil, err
+	}
+	_, err = session.Exec("update user set num_repos = num_repos + 1 where id = ?", user.Id)
+	if err != nil {
+		os.RemoveAll(f)
+		session.Rollback()
+		return nil, err
+	}
+	err = session.Commit()
+	if err != nil {
+		os.RemoveAll(f)
+		session.Rollback()
+		return nil, err
+	}
+	return &repo, nil
+}
+
+// list one user's repository
+func GetRepositories(user *User) ([]Repo, error) {
+	repos := make([]Repo, 0)
+	err := orm.Find(&repos, &Repo{OwnerId: user.Id})
+	return repos, err
+}
+
+func StarReposiory(user *User, repoName string) error {
+	return nil
+}
+
+func UnStarRepository() {
+
+}
+
+func WatchRepository() {
+
+}
+
+func UnWatchRepository() {
+
+}
+
+//
+// delete a repository for a user or orgnaztion
+//
+func DeleteRepository(user *User, reposName string) error {
+	session := orm.NewSession()
+	_, err := session.Delete(&Repo{OwnerId: user.Id, Name: reposName})
+	if err != nil {
+		session.Rollback()
+		return err
+	}
+	_, err = session.Exec("update user set num_repos = num_repos - 1 where id = ?", user.Id)
+	if err != nil {
+		session.Rollback()
+		return err
+	}
+	err = session.Commit()
+	if err != nil {
+		session.Rollback()
+		return err
+	}
+
+	err = os.RemoveAll(filepath.Join(root, user.Name, reposName))
+	if err != nil {
+		// TODO: log and delete manully
+		return err
+	}
+	return nil
+}
diff --git a/models/user.go b/models/user.go
new file mode 100644
index 00000000..4093c5cc
--- /dev/null
+++ b/models/user.go
@@ -0,0 +1,148 @@
+package models
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/dchest/scrypt"
+) // user type
+const (
+	Individual = iota + 1
+	Organization
+)
+
+// login type
+const (
+	Plain = iota + 1
+	LDAP
+)
+
+type User struct {
+	Id            int64
+	LowerName     string `xorm:"unique not null"`
+	Name          string `xorm:"unique not null"`
+	Email         string `xorm:"unique not null"`
+	Passwd        string `xorm:"not null"`
+	LoginType     int
+	Type          int
+	NumFollowers  int
+	NumFollowings int
+	NumStars      int
+	NumRepos      int
+	Avatar        string    `xorm:"varchar(2048) not null"`
+	Created       time.Time `xorm:"created"`
+	Updated       time.Time `xorm:"updated"`
+}
+
+type Follow struct {
+	Id       int64
+	UserId   int64     `xorm:"unique(s)"`
+	FollowId int64     `xorm:"unique(s)"`
+	Created  time.Time `xorm:"created"`
+}
+
+const (
+	OpCreateRepo = iota + 1
+	OpDeleteRepo
+	OpStarRepo
+	OpFollowRepo
+	OpCommitRepo
+	OpPullRequest
+)
+
+type Action struct {
+	Id      int64
+	UserId  int64
+	OpType  int
+	RepoId  int64
+	Content string
+	Created time.Time `xorm:"created"`
+}
+
+var (
+	ErrUserNotExist = errors.New("User not exist")
+)
+
+// user's name should be noncased unique
+func IsUserExist(name string) (bool, error) {
+	return orm.Get(&User{LowerName: strings.ToLower(name)})
+}
+
+func RegisterUser(user *User) error {
+	_, err := orm.Insert(user)
+	return err
+}
+
+func UpdateUser(user *User) error {
+	_, err := orm.Id(user.Id).Update(user)
+	return err
+}
+
+func (user *User) EncodePasswd(pass string) error {
+	newPasswd, err := scrypt.Key([]byte(user.Passwd), []byte("!#@FDEWREWR&*("), 16384, 8, 1, 64)
+	user.Passwd = fmt.Sprintf("%x", newPasswd)
+	return err
+}
+
+func LoginUserPlain(name, passwd string) (*User, error) {
+	user := User{Name: name}
+	err := user.EncodePasswd(passwd)
+	if err != nil {
+		return nil, err
+	}
+
+	has, err := orm.Get(&user)
+	if !has {
+		err = ErrUserNotExist
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &user, nil
+}
+
+func FollowUser(userId int64, followId int64) error {
+	session := orm.NewSession()
+	defer session.Close()
+	session.Begin()
+	_, err := session.Insert(&Follow{UserId: userId, FollowId: followId})
+	if err != nil {
+		session.Rollback()
+		return err
+	}
+	_, err = session.Exec("update user set num_followers = num_followers + 1 where id = ?", followId)
+	if err != nil {
+		session.Rollback()
+		return err
+	}
+	_, err = session.Exec("update user set num_followings = num_followings + 1 where id = ?", userId)
+	if err != nil {
+		session.Rollback()
+		return err
+	}
+	return session.Commit()
+}
+
+func UnFollowUser(userId int64, unFollowId int64) error {
+	session := orm.NewSession()
+	defer session.Close()
+	session.Begin()
+	_, err := session.Delete(&Follow{UserId: userId, FollowId: unFollowId})
+	if err != nil {
+		session.Rollback()
+		return err
+	}
+	_, err = session.Exec("update user set num_followers = num_followers - 1 where id = ?", unFollowId)
+	if err != nil {
+		session.Rollback()
+		return err
+	}
+	_, err = session.Exec("update user set num_followings = num_followings - 1 where id = ?", userId)
+	if err != nil {
+		session.Rollback()
+		return err
+	}
+	return session.Commit()
+}