The main traditional remedial measure against liquefaction is the compaction method，but it has a limited compaction effect for silty sand soil layer with high fines content. The measure based on drainage method is needed，however，there is no relevant assessment method providing in nation standard for reference. Based on the different assessment methods for drainage criterion against liquefaction from domestic and international researchers，we carry out the calculation for selected engineering and analyze the differences of methods. The results show that the equal strain method is simpler when comparing with the free strain model method，thus it is more convenient for engineering application. The computational excess pore pressure ratio based on the method without considering well resistance is only 10% to 24% than the method with considering well resistance. The computational excess pore pressure ratio from Wang Sigen’s method of equal strain model increases with depth，which is consistent with the site liquefaction survey. Further，the average and maximum value from Wang Sigen’s method is higher than Onoue’s and Wu Shiming’s methods.