The home energy management system is one of the most important applications of future smart power grids. This paper takes home DC microgrid system which contains photovoltaic power generation system, battery energy storage system and home load as a study objective. It studies the basic control strategy of each unit, and proposes an energy scheduling policy for home microgrid based on microgrid technology. The system can operate not only in-grid mode but also in off-grid mode. The energy scheduling policy can balance the system power and stabilize the DC voltage. The home DC microgrid system is simulated using Matlab/Simulink to verify the proposed control strategy. Simulation results indicate that the DC voltage can be stabilized under both in-grid mode and off-grid mode, verifying the validity and effectiveness of home energy management system.