There is currently no simple and practical calculation method for the anti-liquefaction of gravel pile drainage.Based on the consolidation theories for sand wells under equal strain condition,assumed that the initial excess pore water pressure is linearly distributed,the solution method of pore pressure ratio of gravel pile under drainage and liquefaction resistance under earthquake is given.A simple and feasible algorithm for engineering design is provided,which is recommended to use radial average pore pressure ratio to meet project needs.On the basis of the comparison with Onoue(1987) in-situ experimental results of gravel piles,the feasibility and deviation of the method are illustrated.Some suggestions are put forward for selection of design parameters of gravel drains to prevent liquefaction.