$list = db('test_paper')
			->alias('p')
			->Join('test_paper_user u',"u.paper_id=p.id and u.deleted=0 and u.is_finish=0 and u.user_id='".$Session['user_id']."'")
			->field('p.id,p.title,p.description,p.img')
			->where($where)
			->group('p.id')
			->order(['p.id' => 'desc'])
			->paginate(6,false,['query' => request()->param(),'type' => 'page\Page','var_page'  => 'page']);
 

->Join('test_paper_user u',"u.paper_id=p.id and u.deleted=0 and u.is_finish=0 and u.user_id='".$Session['user_id']."'")