Service period system,as a legal means to protect the employers' own rights and interests by restricting the core employees' random leave, has not been clearly defined in the Labor Law,but it has been widely applied to the labor contract system in practice.It relates not only the labor game between the employees and the employers,but also between the old and the new employers.Therefore,a reasonable Service period system could not only encourage employers to invest in human resources,but also promote the fre...