Step1. Export zt_user of ZenTao.
Step2. Import zt_user to Zdoo database after installation. 
Step3. Execute SQL.

replace into sys_user (account,password,realname,role,email) select account,md5(concat(password, account)) as password,realname,role,email from zt_user;
update sys_user set admin='super' where account='admin';