The purpose of this study is to examine how perceived overqualification (including perceived overeducated and mismatch) and work engagement impact on employees' turnover intention. The survey sampling are full-time employees in Taiwan by internet and traditional questionnaires survey. Total 292 valid has received. The research result found the perceived overeducated and perceived mismatch negatively related to employees' work engagement. Work engagement negatively related to employees' turnover intention. Moreover, by hierarchical regression process, we found that employees' work engagement mediated the relationship between perceived overeducated and employees' turnover intention, on the other hand, employees' work engagement partially mediated the relationship between perceived mismatch and employees' turnover intention. The study provide the practical implications and further research suggestions.