For the design and application of the jet grouting pile in stabilizing the slope,combining with the upgrading of a wharf using the jet grouting pile reinforcement,we compare the PLAXIS based on the strength reduction method and the GEO-SLOPE calculation method,and propose the PLAXIS for the slope strengthening by the jet grouting pile,which is more adaptable.According to the results of on-site sampling test,the average compressive strength of the jet grouting pile in silty clay can reach 6 MPa,the average internal friction angle is about 30°,and the average value of the cohesive force is about 0.5 MPa,which meets the design requirements.Therefore,the application of the jet grouting pile in the upgrading of the wharf is reasonable.