Abstract: The models of calculating rock parameters of coal-seam were optimized on the basis of common log information.It was put forward that transforming dynamic and static elastic parameters by indoor core test results.The optimized model and algorithm for regressing tectonic stress coefficient by fracture construction information were set up which was economical and practical rock parameter explanation method.Actual application in Hancheng block of Erdos Basin showed that this method could precisely and reliably explain Passion ratio，elastic module，tension strength，3-d stress，fracture pressure and other rock parameters，and meet the demand of coalbed methane resource evaluation，boring，production increase and drainage.