Employability refers to the ability to obtain t, maintain and to obtain a new employment. We study the effect of internship on college students through in-depth interviews, the grounded theory and the content analysis, and reach the conclusions: 1) the lagging of STW education is the most significant background characteristics in China, 2) the effect of internship on employability is to make up for the lack of STW education in early stages, to help them understand the differences between school and work, but not to improve the abilities and skills.