China’s power market reform has brought certain risks to the market operation. A comprehensive and objective risk assessment system is needed to quantify the existing risks and potential risks of the current power market operation. By mining and analyzing the risk factors from four aspects, such as market structure, market subject, market efficiency and market operntion mechanism, the corresponding indicators are extracted. The weighting of each index is calculated by combining the improved analytic hierarchy process and the entropy weight method. The multi - dimensional evaluation of power market risk is carried out with an example to verify the proposed the applicability and validity of the evaluation model.