While adopt airline services, safety is a very important services attribute. However, the accident rate of our airline is above the Asia average rate. By the diminishing of accident rate due to mechanical and environmental factors, the accidents are mainly caused by human factors. Because commercial pilots bear the duty of flight safety, their job stress is higher than other occupations. If the sources of job stress could not be reduced and drained off, the stress will be accumulated continually, and injure the commercial pilots in aspects of physical, psychological and job satisfaction and have a critical impact on their flying ability as a result. Therefore, improving the airline safety through management pilot's job stress is an important issue. This research introduces the concept of work experience to the job stress model. LISREL is used to validate the causality relationships of this theoretical model. The result of this research could be a theory base to improve the job stress of the commercial pilots by adjusting work experience.