The study of saturation sand liquefaction has been lasted many years,and we have deep understanding of it.We also got a lot of achievement on some methods,such as the Seed simplified method,shear wave velocity method and standard penetration test(SPT).In this paper,mainly introduce SPT widely utilized in our country,and how to use numerical method to determine the anti-liquefaction of site.Put forward the prospect that utilize minisize penetration test to judge the liquefaction of saturated sand.