In light of chemical kinetic principles the process of thermal degradation of kerogen is dividedinto three phases，i．e．，generation of biochemical gas，thermal catalytic oil／gas and thermal．crack gas and the products of various generation phases are taken into account．on that basis amodel of chemical kinetics for hydrocarbons generation is proposed and applied to the study onhydrocarbon generation in basin simulation of the Luxi hollow of the Kailu basin．