In Republic of China, Labor Pension Act (to be called the New Mechanism for short in the following) was officially carried out in July 1, 2005. Being different from the Labor Standards Act (to be called the Old Mechanism for short in the following), the biggest feature of the new mechanism is that the retirement fund is portable. However, with the new mechanism , people are guaranteed to receive the retirement fund while they will get more money if they choose the old mechanism . Therefore, the problem of how to choose the suitable mechanism for the employees who were hired before July 1, 2005 has been discussed. Generally, if the employee doesn¡¦t have the intention to change his job, and has more confidence to his company, he should choose the old mechanism . On the contrary, he should choose the new mechanism . Thus, whether the employee chooses the new or old mechanism seems to become the important reference for the employer to test the employee¡¦s royalty and confidence toward the company. Someone even predicted that the implementation of the new mechanism would symbolize the coming of job changing boom. This report is based on the actual research of enterprises, and tries to understand and investigate the connection between employees and job stress, job satisfaction, and organization commitment. Moreover, based on the unstable character of individual, this report is trying to prove and understand if there is an obvious difference between the influence of job stress, job satisfaction, organization commitment, and the willing of changing job to make the employees choose the old or new mechanism . This is to provide the reference for enterprises to make plans for the human resources. Through this research, I found out the following in certain cases: 1. There is an obvious connection among the employees¡¦ job stress, job satisfaction, and organization commitment. 2. Job satisfaction and organization commitment have obvious influence to one¡¦s willing to change jobs. 3. The employees who change their mind to choose either the new policy or the old policy have obvious difference to the influence of job satisfaction, organization commitment, the willing of changing jobs, etc