The suppression or utilization of the peg-leg multiple wave is a difficult problem in seismic data processing and interpretation. The forward simulation constitutes the basis of suppressing or utilizing peg-leg multiple wave. Using the nonlinear model theory of layered media, the authors developed a method for forward simulation of peg-leg multiple wave. The tentative application of this method to deep seismic data interpretation in the Zhongyuan oilfield yielded some useful results. This method can also play its role in the analysis and processing of seismic elementary wave and the improvement of seismic data resolution.