We put forward an approach for modeling the transient response of solid pile with large diameter,and the generalized defects are divided into three types including mutation defect,gradient defect and combined defect.Based on the Rayleigh-Love theory,plain strain model and fictitious soil model,we form the mathematic frame,adopt the integral transformation methods to solve the equations,and program effective the calculation process.On this basis,the differences in the simulated results of the three types of defects are compared,and the differences in the reflected wave characteristics between the peripheral contamination at the base and the bottom sediment are discussed.The present method is proved to be rational and will be conducive to the analysis and judgment of reflected wave curve with complicated defects.