Abstract: The main principle of inversion procedure is presented based on the Markov chain and Monte?Carlo method (MCMC). Three key links, such as homogenization of logging data, seismic wavelet acquisition, synthetic seismogram and structural modeling and constraint MCMC inversion, are highlighted. The applied results indicate that using this method can improve the accurate degree of identification of sand body in thin sand?mud interbed and enrich the details of sand?body distribution in two flanks on fault. Also, this method is helpful to get an exact location to the boundary of channel sand and determine the contact relationship between the major sand bodies, hence providing basis for tapping potential of the remaining oil and well pattern structural adjustment in late period of an oilfield development