中文摘要：

By applying man-machine-environment system engineering theory,safety risks on large scale field operation project have been evaluated in this article. The factors concerning with the man,machine and environment in system were proposed separately. The value for lowest indexs was determined by decision-making of expert group. The weights were calculated based on AHP,and then safety risk assessment in different layers was made. The results show that the assessment method is reasonable,and it is significant for large scale field operation project safety managerment.

英文摘要：

By applying man-machine-environment system engineering theory, safety risks on large scale field operation project have been evaluated in this article. The factors concerning with the man, machine and environment in system were proposed separately. The value for lowest indexs was determined by decision-making of expert group. The weights were calculated based on AHP, and then safety risk assessment in different layers was made. The results show that the assessment method is reasonable, and it is significant for large scale field operation project safety managerment.