Based on the job demands-resources model, this study explored the relationships of work engagement, job performance and psychological capital in industry employees. A total of 399 IT programmers were recruited and completed the work engagement scale, knowledge employee job performance scale and psychological capital questionnaire. The results showed that: There is a relationship between work engagement and job performance, which may not be linear but inverted U-shaped, and psychological capital plays a moderating role in the inverted U-shaped relationship between work (...) engagement and job performance. (shrink)