The liquefaction of sandy layer is an important index of the site and foundation seismic effect.The liquefaction of sandy layer discrimination method based on the standard penetration test and static cone penetration test ,etc.are mainly adopted for the harbor engineering in China.However,the simplified method of seed and the estimation method based on the probability and statistical analysis are adopted in Europe and America,Africa and Southeast Asia.Analyzing a variety of liquefaction discrimination methods,we prove the rationality of the method.According to different kinds of project,we apply it to the seismic effect for the harbor engineering.