Abstract: Fased the circumstances of less influence factors analysis on the seismic reflection characteristics, this article obtains from the angle of forward, forward model is established for the analysis of reservoir thickness, sandstone superimposed relationship, sandstone thickness and interlayer thickness on the influence of seismic reflection characteristics. The reservoir thickness and thin-sandstone have little influence on the characteristic of seismic reflection, thick sandstone in seismic wave energy is strong, with thick sand wave up degree is more obvious. Interlayer thickness and positively correlated to the influence degree of the seismic reflection characteristics, when the insulation layer thickness more than 30 meters, no longer have an impact. After the conclusion is that analysis of seismic reflection characteristics and the relationship between the underground sand bodies, providing certain guidance to predict channel sand body.