Coal geology emphatically studies always stratigraphy and sedimentology of coal and coal-bearing strata. In the last 30 years it has gradually revealed and confirmed the problem of coal-forming environment in the eyes of the products of modern coal-accumulating processes (peats and peatswamps). But it is difficult to find a modern suitable analogue of ancient coal. Since the end of 1980' s, geologists have paid more and more attention to the tropical woody and domed peats and peatland in Southeast Asia, have got generous data and observation results, and have opened up a new prospect in correlation of peat with coal-forming environment. New materials, standpoints and knowledges are particularly important in control on peat-accumulation, models of peat-accumulation and the characteristics of peat-forming ecologic systems, peat petrography, facies and geochemistry and their interrelations and space distribution.