Many enterprises see job analysis as a one-time work, so they always ignore the maintenance work of the instructions. After a large-scale job analysis of establishing the enterprise’s job description system, the work is not over, because the maintenance of job description is a long-term existing human resource management work. For example, the department setting and responsibilities, job setting and the adjustment of duties, the improvement of business process, the replacement of production technology or equipment, the modification of management and management systems, all of these require the revising of the work statement in varying degrees.