China’s economic development has entered into a stage of “new normal”, with the market-oriented reform of electricity is deepening, the market risks faced by power generation enterprises are becoming increasingly severe. To reduce the loss caused by market risks and promote the efficiency of market operation, this paper established and evaluated the credit evaluation system for power generation enterprises. Specifically, based on spot power trading market, this paper firstly established a credit risk evaluation index system by assessing the credit risk of market trading members from four main aspects; then, the credit risk of typical enterprises has been analysed by fuzzy synthetic evaluation method. The result showed that power generation enterprises should focus on improving their financial ability such as profit and debt repayment in the operation process, attention should also be paid to integrity due to improving the performance rate of spot trading in the transaction process.