With the continuous development of society, mechanical design and manufacturing technology is also making rapid progress. Power mechanical engineering major is a demand for more professional. Employ ability refers to the basic qualities of students. In order to enhance students' employ ability, this paper explores the main principles of their ability evaluation. It can be regarded as one of the most important, energetic and potential levels for a person's survival and development. Because of the complexity of technology, the employment prospects of mechanical engineering students depend on their innovation and practical ability. This paper mainly uses the survey method and analytic hierarchy process to study the employment of power mechanical engineering major. According to the survey results, the employment ability of the students in this major is above the average level, but only 5.8 percent of them have excellent knowledge ability. This falls far short of the country's needs. Therefore, it is necessary to cultivate graduates' knowledge and practical skills from these two aspects.