The deep interbeds of sand and shale reservoir is a kind of typical low porosity and low permeability reservoir, which generally has the characteristics of deep burial, rapid lateral variation, and deep physical difference, etc. The traditional thin layer quantitative description method can only identify the stratigraphic whose thickness is less than λ/4, and it’s difficult to realize fine interpretation. Therefore, the paper firstly uses inversion joint prediction techniques to establish geological models for wave equation forward, and then analysis the target layer’s characteristics of seismic wave field from the forward angle. Finally, we apply wave impedance inversion that is based on forward modeling results to make quantitative analysis for inversion sand’s horizontal and vertical distribution characteristics. The results show that the seismic identification method which is based on forward model can not only unleash the advantages of seismic horizontal distribution, but also improve the accuracy of interpretation in the vertical direction. And the results can provide references for identifying deep thin sand shale interbedding reservoirs in Qianliyuan area.