In the case of the rapid development of distributed photovoltaic, the absorption of photovoltaic power has become an issue of concern. This paper establishes a microgrid system containing photovoltaic, energy storage system and demand response. The primary target is to maximize the absorption of photovoltaic power, and also considers minimizing the cost of power using. It sets several constraints for the objective function, including power balance, reliability of the microgrid, power bound of energy storage system, demand response and limit of photovoltaic output. In order to analyze the effects of energy storage and demand response on the absorption of photovoltaic, it sets four scenes including not considering energy storage system or demand response, only considering energy storage system, only considering demand response, considering both energy storage system and demand response. It uses the modified MICA to solve the problem of too many constraints. By comparison, it finds that using energy storage system and demand response can improve the absorption of photovoltaic power and also ensure the economic benefits at the same time. This work is supported by National Natural Science Foundation of China (No.51177112).