Abstract: Abstract:As the coal bed methane (CBM) production of our country commonly exists some problems such as large area of CBM extraction, wide distribution, decentralized and remote location of most wells, which result in difficult construction and high cost of traditional AC distribution network. In this sense, this paper proposed a DC microgrid supply system for CBM extraction, where photovoltaic panels and batteries are employed to supply the beam pump for CBM wells. The simulation model based on MATLAB/SIMULINK verifies the theoretical analysis.