The purpose of the study is to analyze the reasons for occupational accident from Taiwan Power Company and contractors employees? safety accidents case. The study are according to Taiwan power company each department that include 6 categories safety accidents case (include death and Injury-disabling Injury) from 1997 to 2006, the analysis categories are as follows: (1)Sex (2)The age occur the harm (3)Working department (4)Working experiences (5)Education degree (6)Accident type. The study proceeds the statistics and analysis on them. The study try to find out TPC's employee their working disaster?s major cause and potential hazard factor of harmful working accident from the statistics and analysis information to understand the characteristics and influence of disaster obstacle. The study also collected reference documents to bring up strategies and suggestion that will be well prepared and presented to prevent safety disaster happened. The results of the study showed that employee's accident type are related with high and low temperature and touch the hazardous substances was the highest, it slender higher than falling. The Injury reason include unsafe acts and unsafe conditions, they can use these protection measures to reduce the disaster rate. Contractors employees? occurred 331 safety accidents case, the number of death will be 158. Contractors employees' disaster proportion is higher than Taiwan Power Company employees'. The results showed that Taiwan Power Company contract great danger project to contracts business. The study suggested every employees should execute the regulation of personal protection while working and follow up the standard operating procedure to avoid of accidents. The business should give the employees training education of safety and health. Both of counter-measures mentioned above can reduce the risk of injuries.