The main purposes of this study were to investigate core employability performance of graduates, the difference made by background diversity on this employability, and the relationship between participation in career guidance and core employability performance. 954 science and technology university graduates from the 2014 academic year participated in this study. A self-assessment scale of core employability was used to collect data. The results showed that core employability performance of graduates of technology universities was in the mid-high range, and there were significant differences among variables of gender, school systems, colleges, and departments. Most graduates held part-time jobs or internships or received practical training via career guidance activities. There was a statistically significant low association between participation in career guidance and core employability performance. Based on these results, the implications of an increase in college students' core employability and future research was discussed.