Abstract: According to the fact of implementing peak and valley time price in our country, the paper constructs the classification optimization model of multiple-consumers participating in the measure.The first grade optimization model of multiple-consumers particating in peak and valley time price is established based on consumers' uncertain responses.Then, the second-grade optimization model of evaluating the risk losses of power supply companies and consumers implementing the measure is established with interval method.According to given risk threshold values, the filtration method of the optimization peak and valley time price project can be obtained.The example shows that the method has some maneuverability and it can provide reference for power supervise department to push the measure.

Key words: response of electricity demand, peak and valley time price, interval method, risk measure