diff --git a/app/Helpers/Str.php b/app/Helpers/Str.php
new file mode 100644
index 00000000..1e8906e8
--- /dev/null
+++ b/app/Helpers/Str.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Helpers;
+
+class Str
+{
+    /**
+     * 生成给定长度的随机英文字符串
+     *
+     * @param int $length
+     * @return string
+     */
+    public static function randomAlpha(int $length = 6): string
+    {
+        $characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
+
+        $max = strlen($characters) - 1;
+
+        $str = '';
+
+        for ($i=0; $i < $length; $i++) {
+            $str .= $characters[mt_rand(0, $max)];
+        }
+
+        return $str;
+    }
+}
diff --git a/app/Models/User.php b/app/Models/User.php
new file mode 100644
index 00000000..d2c2cabe
--- /dev/null
+++ b/app/Models/User.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Auth\Authenticatable;
+use Illuminate\Contracts\Auth\Access\Authorizable as AuthorizableContract;
+use Illuminate\Contracts\Auth\Authenticatable as AuthenticatableContract;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Foundation\Auth\Access\Authorizable;
+
+class User extends Model implements AuthorizableContract, AuthenticatableContract
+{
+    use Authenticatable;
+    use Authorizable;
+    use HasFactory;
+
+    public const STATUS_FROZEN = -1;            // 冻结
+    public const STATUS_INACTIVATED = 0;        // 未激活
+    public const STATUS_ACTIVE = 1;             // 正常
+
+    /**
+     * @var array
+     */
+    protected $attributes = [
+        'status' => self::STATUS_ACTIVE,
+    ];
+
+    /**
+     * @var array
+     */
+    protected $fillable = [
+        'username',
+        'password',
+        'phone',
+        'phone_verified_at',
+        'email',
+        'email_verified_at',
+        'last_login_ip',
+        'last_login_at',
+        'register_ip',
+        'status',
+        'status_remark',
+    ];
+
+    /**
+     * @var array
+     */
+    protected $casts = [
+        'phone_verified_at' => 'datetime',
+        'email_verified_at' => 'datetime',
+        'last_login_at' => 'datetime',
+        'status' => 'int',
+    ];
+}
diff --git a/app/Models/UserInfo.php b/app/Models/UserInfo.php
new file mode 100644
index 00000000..0117bdf6
--- /dev/null
+++ b/app/Models/UserInfo.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace App\Models;
+
+use App\Helpers\Str;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class UserInfo extends Model
+{
+    use HasFactory;
+
+    public const GENDER_UNKNOWN = 'unknown';    // 未知
+    public const GENDER_MALE = 'male';          // 男性
+    public const GENDER_FEMALE = 'female';      // 女性
+
+    /**
+     * @var array
+     */
+    protected $attributes = [
+        'gender' => self::GENDER_UNKNOWN,
+    ];
+
+    /**
+     * @var array
+     */
+    protected $fillable = [
+        'user_id',
+        'inviter_id',
+        'nickname',
+        'avatar',
+        'gender',
+        'birthday',
+    ];
+
+    /**
+     * @var array
+     */
+    protected $casts = [
+        'birthday' => 'date',
+    ];
+
+    /**
+     * {@inheritdoc}
+     */
+    protected static function booted()
+    {
+        parent::saving(function ($userInfo) {
+            // 如果没有邀请码，则自动分配邀请码
+            if ($userInfo->code === null) {
+                do {
+                    $userInfo->code = Str::randomAlpha(6);
+                } while (static::where('code', $userInfo->code)->exists());
+            }
+
+            // 邀请码统一小写
+            $userInfo->code = strtolower($userInfo->code);
+        });
+    }
+}
diff --git a/database/migrations/2021_11_19_135844_create_users_table.php b/database/migrations/2021_11_19_135844_create_users_table.php
new file mode 100644
index 00000000..84a2505d
--- /dev/null
+++ b/database/migrations/2021_11_19_135844_create_users_table.php
@@ -0,0 +1,43 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateUsersTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('users', function (Blueprint $table) {
+            $table->id();
+            $table->string('username')->unique()->nullable()->comment('用户名');
+            $table->string('password')->nullable()->comment('密码');
+            $table->string('phone')->unique()->nullable()->comment('手机号');
+            $table->timestamp('phone_verified_at')->nullable()->comment('手机号认证时间');
+            $table->string('email')->unique()->nullable()->comment('邮箱');
+            $table->timestamp('email_verified_at')->nullable()->comment('邮箱认证时间');
+            $table->ipAddress('last_login_ip')->nullable()->comment('最近登录IP');
+            $table->timestamp('last_login_at')->nullable()->comment('最近登录时间');
+            $table->ipAddress('register_ip')->nullable()->comment('注册IP');
+            $table->tinyInteger('status')->default(1)->comment('状态: -1 冻结，0 未激活，1 已激活');
+            $table->string('status_remark')->nullable()->comment('状态备注');
+            $table->rememberToken();
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('users');
+    }
+}
diff --git a/database/migrations/2021_11_19_142529_create_user_infos_table.php b/database/migrations/2021_11_19_142529_create_user_infos_table.php
new file mode 100644
index 00000000..4a47630b
--- /dev/null
+++ b/database/migrations/2021_11_19_142529_create_user_infos_table.php
@@ -0,0 +1,38 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateUserInfosTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('user_infos', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('user_id')->unique()->comment('用户ID');
+            $table->unsignedBigInteger('inviter_id')->nullable()->comment('邀请人ID');
+            $table->string('nickname', 100)->nullable()->comment('昵称');
+            $table->string('avatar')->nullable()->comment('头像');
+            $table->enum('gender', ['male', 'female', 'unknown'])->default('unknown')->comment('性别：male 男性，female 女性，unknown 未知');
+            $table->date('birthday')->nullable()->comment('生日');
+            $table->string('code', 10)->unique()->comment('邀请码（全小写）');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('user_infos');
+    }
+}