With the development of energy internet, various technologies will be firstly applied to user-side microgrid so as to change the traditional power generation, transmission and operation mode. With various distributed energy, energy storage devices and controllable loads integrated into user-side microgrid, it can provide high flexibility and efficiency for energy conversion and consumption under energy internet environment. The form, key technologies and business mode of user-side microgrid in energy internet environment are envisioned, coordinated operations within a microgrid or among microgrids are studied. Based on forecasting technologies of distributed energy supply and user demand, an optimal operation model for user-side microgrid is proposed. A distributed model predictive control technology is applied to online updating forecasting information and operation status of microgrids so as to optimize the operation strategies of upper and lower layer to converge to an equilibrium point. The proposed optimal operation strategy provides reference for dispatch and operation of user-side microgrids.