Abstract: According to the inhomogeneity of reaction mass structure consisting of coal, biomass wastes, macro molecule intermediates and oil products as well as the complexity of the liquefaction process interwoven by a series of consecutive and parallel reactions, a kinetic model is put forward to simulate the process of coliquefaction of coal and biomass waste. Such a route for coliquefaction in this model is based on that coal and biomass is first, through thermal cracking, converted parallely to form preasphaltene, asphaltene and low molecule gaseous products and then consecutively oil is formed from preasphaltene and asphaltene. Activation energies for these three reactions are 59.8kJ/mol, 43.7kJ/mol and 84.0kJ/mol respectively. Under specific reaction conditions, coal, biomass, preasphaltene and asphaltene , each can be described in this model to be composed of two fractions, one of which is convertible, the other is unconvertible . Calculated values from this model agree with the experimental data fairly well.