Abstract: The concept of coal system is based on coal geology and the theory of system.Its basic factors are substance sources (plant & peat),coal accumulation environment and underground thermal flow.While its geologic activities include peat accumulation and transportation,embedding activity caused by diastrophism and geothermal metamorphism of coal.The collocation of these basic factors and coal forming activities in time and space allows the formation of valuable coal beds.A coal system can be divided into substance source subsystem,accumulation subsystem and metamorphism system in temporal range.Whereas in special range it may fall into several low class subsystems,resembling with super coal system.