A system planning model is proposed considering the operation strategy constraint of hybrid energy microgrid. A hybrid energy system model is established including solar power， wind power， micro-turbine and energy storages. Taking the minimum annual net cash flows as the target， an example analysis is used to design a smart park hybrid energy system， and a variable step space search process is used to achieve the best distributed power unit capacity. According to the optimal result， the system energy balance relationship in different seasons and times is analyzed， and the influence of time of use power price on the microgrid operation is discussed.