Abstract: Through the study in depth of the data of injury accidents in the trade of hy droelectric engineering construction in recent 16 years, characteristics and reg ularity of the accidents have been induced. It is found that some new changes ar e happening. For example, besides the car accidents, gas explosion and other acc idents happened in excavating engineering had become the new focus of collective injury accidents. The high probability accidents take place so densely that the y occupy 46.32 % of death cases in this field according to statistics. And the a verage economic loss for each accident depletion has exceeded a hundred thousand yuan.