Objective To investigate the prevalence and symptoms of post - traumatic stress disorder(PTSD) and the self-esteem of the workers at mineral processing plant 45 days after Wenchuan earthquk. Methods PTSD Checklist Civilian version(PCL - C) , Self -Esteem Scale(SES) , Simplified Coping Style Questionnaire and a self- designed questionnaire were administered to a sample of 81 workers one and a half month after Wenchuan earthquake. Results The prevalence of PTSD among the workers was 26.3% , and the mean total scores of PCL - C was 39.63?10.73.The prevalence difference between the male and the female was not statistically significant (P =0.527). The top psychological activity was worry (86.8%). The mean self- esteem score had no statistical difference with domestic normal level(t = -0.484,P =0.630). Neither self - esteem(P =0.469) nor coping style(P =0.780) was associatied with PCL -C total scores. Conclusion To act more effectively in the intervention, it is important to exactly understand the normal stress response after severe disaster, and correctly grasp the key point in different stage.