In order to study application of waveform fitting method of high strain dynamic testing methods in testing vertical bearing capacity of single-egress analysising of the data of pile shaft resistance and corresponding pile-soil relative displacement.The analysis indicates that hyperbola can fit the relation of pile shaft resistance and the corresponding pile-soil relative displacement well.So a new method to gaining quake limit for stratified soil is designed.Applying the method to actual engineering,and achieved more reasonable results.