Based on the comparative analysis of relevant policies, documents, work reports and demonstration projects at home and abroad, the implementation modes of demand response between China and America are compared around the types, time scales of America, as well as the start up conditions, advanced notification time at home. The implementation scale between China and America is compared by analyzing implementation effects such as load reduction, the number of participant users, the scale of subsidies or incentives. The policy advantages and urgent technical requirements of developing demand response business at present are analyzed, and the key problem to be solved about development of demand response in the future is pointed out, hoping to provide some references for the development of domestic demand response business, especially for the research of key technology of demand response and the design of business model.