This study aimed to discuss the effect on the employment ability of vocational college students from Engineering Department in Grade 2 when Corporate Identity System (CIS) was integrated into autobiography teaching. By adopting the experimental approach and action research, students were divided into the experimental group and the control group to carry out the experiment teaching for 10 weeks, and the scale for employment ability was self-made, including 4 dimensions of (1) general ability, (2) professional knowledge and skills, (3) professional attitude and (4) career planning, and totally 11 items of ability indicators. The two groups of students were tested according to the scale for employment ability before and after the teaching, and covariance analysis and dependent sample t-test were used for analysis. and As well as the quantitative data, the record of students' learning course, feedback, students' works, as well as the quantitative data were also collected. The conclusions of this study were (1) when CIS was integrated into autobiography teaching, the post-test score of students' employment ability in the experimental group was significantly higher than the score in the pre-test, and (2) the score of students' overall employment ability in experimental group was significantly higher than that of students in control group; (3) CIS can be effectively integrated into the teaching of autobiography course to improve vocational college students' overall employment ability. Moreover, based on the research results, the teaching model of integrating CIS into autobiography courses was constructed, and several suggestions were provided as the reference to improve vocational college graduates' employment ability.