Based on the analysis of main influential factors of p-y curve and a project field testing result and according to the calculation method suggested in the code ,this paper selects suitable characteristic parameters and strength index of soft clay and establishes a new p-y curve method and compares with calculation results of m-method, NL-method and standard p-y curve method. The results show that the calculated value and measured value of the maximum bending movement of pile integrity are close to each other, but there are significant differences among different calculation methods and the calculated value of the suggested p-y curve is the best one to fit the measured value.