Abstract：Sectional decomposition technique is a new one for calculating the numerical solution of partial differential equation. Having divided a whole section into many regular small subsections,we can make solution by using optimum method in each subsection, so that we can fully use the advantage of each numerical modeling method,and then improve forward solution.We introduce sectional-decomposition into numerical modeling of seismic wave field. Analytic method is used in uniformly-layered medium subsection,and numeri-cal method in complicated-structural subsection. As a result,we make full use of the advantages of analytic and numerical methods. Sectional-decomposition numerical modeling of seismic wave field has been proved to be convergent theoretically,and its software has been tested on many theoretical models to result in satisfactory re-sults.
