The combination of contract transaction and day-ahead bidding transaction makes the power market operation be characterized by market competition besides its industrial features. The power market transaction can then reflect the market price to some degree, and the clear price can be controlled. 合约交易和日前竞价交易相结合使电力市场运营既符合行业特点又具有市场竞争,它使电力市场交易在一定程度上反映市场价格信息的同时,又使最后结算电价控制在一定范围之内。