This research addresses the relationship between employee commitment and performance of TQM in behavioral aspects. For the purpose of this research, a research model was suggested, and several hypotheses were established and tested empirically.The model includes employee commitment factors such as empowerment, communication, education and training, and rewards. And three TQM performance factors such as internal quality performance, external quality performance, and customer satisfaction are also considered. Also this research tests whether implementation periods of TQM modulates the relationship between employee commitment factors and performance or not. Survey data of 405 samples were analyzed statistically.The results show that employee commitment factors affect the performance of TQM significantly. And it was found that implementation periods of TQM modulated the relationship between them.