In the light of geological characteristics and statistical as well as logging data of the coalbed in the eastern depression of Liaohe Oilfield, the authors used regression to make industrial analysis of coalbeds and coal ranks. Through the analysis of coalbed gas characteristics and the utilization of Langmuir's equation, sorption isotherm and neutron background value of coalbed gas, the formulae for calculating coalbed methane content were deduced. The techniques were proved to be effective by the practical well log data from the eastern depression in Liaohe Oilfield.