diff --git a/nexus/Install/Install.php b/nexus/Install/Install.php
new file mode 100644
index 00000000..9453a251
--- /dev/null
+++ b/nexus/Install/Install.php
@@ -0,0 +1,209 @@
+<?php
+
+namespace Nexus\Install;
+
+class Install
+{
+    private $currentStep;
+
+    private $logFile;
+
+    private $minimumPhpVersion = '7.2.0';
+
+    protected $steps = ['环境检测', '添加 .env 文件', '新建数据表', '导入数据', '创建管理员账号'];
+
+
+    public function __construct()
+    {
+        $this->currentStep = min($_REQUEST['step'] ?? 1, count($this->steps));
+        $this->logFile = $this->getLogFile();
+    }
+
+    protected function getLogFile()
+    {
+        return sprintf('%s/nexus_install_%s.log', sys_get_temp_dir(), date('Ymd'));
+    }
+
+    public function doLog($log)
+    {
+        $log = sprintf('[%s] [%s] %s%s', date('Y-m-d H:i:s'), $this->currentStep, $log, PHP_EOL);
+        file_put_contents($this->logFile, $log, FILE_APPEND);
+    }
+
+    public function listAllTableCreate($sqlFile = '')
+    {
+        if (empty($sqlFile)) {
+            $sqlFile = ROOT_PATH . '_db/dbstructure_v1.6.sql';
+        }
+        $pattern = '/CREATE TABLE `(.*)`.*;/isU';
+        $string = file_get_contents($sqlFile);
+        if ($string === false) {
+            throw new \RuntimeException("sql file: $sqlFile can not read, make sure it exits and can be read.");
+        }
+        $count = preg_match_all($pattern, $string, $matches, PREG_SET_ORDER);
+        if ($count == 0) {
+            return [];
+        }
+        return array_column($matches, 0, 1);
+    }
+
+    public function listExistsTable()
+    {
+        dbconn(false, false);
+        $sql = 'show tables';
+        $res = sql_query($sql);
+        $data = [];
+        while ($row = mysql_fetch_row($res)) {
+            $data[] = $row[0];
+        }
+        return $data;
+    }
+
+    public function listShouldAlterTable()
+    {
+        $tables = $this->listExistsTable();
+        $data = [];
+        foreach ($tables as $table) {
+            $sql = "desc $table";
+            $res = sql_query($sql);
+            while ($row = mysql_fetch_assoc($res)) {
+                if ($row['Type'] == 'datetime' && $row['Default'] == '0000-00-00 00:00:00') {
+                    $data[$table][] = $row['Field'];
+                }
+            }
+        }
+        return $data;
+    }
+
+    public function listRequirementTableRows()
+    {
+        $gdInfo = gd_info();
+        $tableRows = [
+            [
+                'label' => 'PHP version',
+                'required' => '>= ' . $this->minimumPhpVersion,
+                'current' => PHP_VERSION,
+                'result' => $this->yesOrNo(version_compare(PHP_VERSION, $this->minimumPhpVersion, '>=')),
+            ],
+            [
+                'label' => 'PHP extension redis',
+                'required' => 'optional',
+                'current' => extension_loaded('redis'),
+                'result' => $this->yesOrNo(extension_loaded('redis')),
+            ],
+            [
+                'label' => 'PHP extension mysqli',
+                'required' => 'enabled',
+                'current' => extension_loaded('mysqli'),
+                'result' => $this->yesOrNo(extension_loaded('mysqli')),
+            ],
+            [
+                'label' => 'PHP extension mbstring',
+                'required' => 'enabled',
+                'current' => extension_loaded('mbstring'),
+                'result' => $this->yesOrNo(extension_loaded('mbstring')),
+            ],
+            [
+                'label' => 'PHP extension gd',
+                'required' => 'enabled',
+                'current' => extension_loaded('gd'),
+                'result' => $this->yesOrNo(extension_loaded('gd')),
+            ],
+            [
+                'label' => 'PHP extension gd JPEG Support',
+                'required' => 'true',
+                'current' => $gdInfo['JPEG Support'],
+                'result' => $this->yesOrNo($gdInfo['JPEG Support']),
+            ],
+            [
+                'label' => 'PHP extension gd PNG Support',
+                'required' => 'true',
+                'current' => $gdInfo['PNG Support'],
+                'result' => $this->yesOrNo($gdInfo['PNG Support']),
+            ],
+            [
+                'label' => 'PHP extension gd GIF Read Support',
+                'required' => 'true',
+                'current' => $gdInfo['GIF Read Support'],
+                'result' => $this->yesOrNo($gdInfo['GIF Read Support']),
+            ],
+        ];
+        $fails = array_filter($tableRows, function ($value) {return $value['required'] == 'true' && $value['result'] == 'NO';});
+        $pass = empty($fails);
+
+        return [
+            'table_rows' => $tableRows,
+            'pass' => $pass,
+        ];
+    }
+
+    public function nextStep()
+    {
+        return $this->gotoStep($this->currentStep + 1);
+    }
+
+    public function gotoStep($step)
+    {
+        header('Location: ' . getBaseUrl() . "?step=$step");
+        exit(0);
+    }
+
+    private function yesOrNo($condition) {
+        if ($condition) {
+            return 'YES';
+        }
+        return 'NO';
+    }
+
+    public function getEnvExampleData($envFile = '')
+    {
+        if (empty($envFile)) {
+            $envFile = ROOT_PATH . '.env.example';
+        }
+        return readEnvFile($envFile);
+
+    }
+
+    public function renderTable($header, $data)
+    {
+        $table = '<div class="table w-full text-left">';
+        $table .= '<div class="table-row-group">';
+        $table .= '<div class="table-row">';
+        foreach ($header as $value) {
+            $table .= '<div class="table-cell bg-gray-400 text-gray-700 px-4 py-2">' . $value . '</div>';
+        }
+        $table .= '</div>';
+        foreach ($data as $value) {
+            $table .= '<div class="table-row">';
+            $table .= '<div class="table-cell bg-gray-200 text-gray-700 px-4 py-2 text-sm">' . $value['label'] . '</div>';
+            $table .= '<div class="table-cell bg-gray-200 text-gray-700 px-4 py-2 text-sm">' . $value['required'] . '</div>';
+            $table .= '<div class="table-cell bg-gray-200 text-gray-700 px-4 py-2 text-sm">' . $value['current'] . '</div>';
+            $table .= '<div class="table-cell bg-gray-200 text-gray-700 px-4 py-2 text-sm">' . $value['result'] . '</div>';
+            $table .= '</div>';
+        }
+        $table .= '</div>';
+        $table .= '</div>';
+
+        return $table;
+
+    }
+
+    public function renderForm($formControls, $formWidth = '1/2', $labelWidth = '1/3', $valueWidth = '2/3')
+    {
+        $form = '<div class="inline-block w-' . $formWidth . '">';
+        foreach ($formControls as $value) {
+            $form .= '<div class="flex mt-2">';
+            $form .= sprintf('<div class="w-%s flex justify-end items-center pr-10"><span>%s</span></div>', $labelWidth, $value['label']);
+            $form .= sprintf(
+                '<div class="w-%s flex justify-start items-center pr-10"><input class="border py-2 px-3 text-grey-darkest w-full" type="text" name="%s" value="%s" /></div>',
+                $valueWidth, $value['name'], $value['value'] ?? ''
+            );
+            $form .= '</div>';
+        }
+        $form .= '</div>';
+        return $form;
+    }
+
+
+
+}
\ No newline at end of file