In order to reduce adverse effects that subjective factors affect the results of the risk assessment in the traditional construction safety evaluation methods, According to the dynamic random and fuzzy characteristic of hydropower construction safety accidents, safety evaluation indexes for hydropower construction are established.Then by using MATLAB to design evaluation model, ANN is applied to safety assessment for hydropower construction. A engineering example proves that the evaluation method has higher accuracy and reliability, which has a certain application value for safety evaluation of hydropower engineering construction.