The gridconnected DC microgrid plays an important role in improving the power supply reliability and power quality in the end of power grid. The traditional optimal method pays more attention to economic of enterprise and little considerations to the utility of the customers. Under the market environment，the development of gridconnected DC microgrid must concern to the interests of users. This paper focuses on a typical gridconnected DC microgrid with windPVdieselstorage and proposes a bilevel optimal model of microgrid configuration, which takes into account economic efficiency of enterprises and customer electricity experience. Considering the initial installation cost，operation and maintenance cost，fuel cost，replacement cost and energy exchange cost of the microgrid，an upper objective model minimizes the comprehensive economic cost, and a lower objective model minimizes the customer power shortage expectations. By constructing the power supply reliability correlation model, a KKT condition is utilized to realize decoupling of bilevel optimal model. The GAACO is then employed to solve the model，and the results of the case study demonstrate the validity and rationality of the model and algorithm.