By using the non-hydrostatic mesoscale numerical model ARPS(Advanced Regional Prediction System),the high-resolution simulation of landfalling process of the strong tropical storm Bilis in 2006,especially the rainfall amplification process after its landfall,is carried out,and comparisons are taken between observations and simulations.Furthermore,the diagnostic analysis by using the high-resolution simulation data is performed to study the rainfall amplification process.Results show that the ARPS reproduces well the landfalling process of Bilis and the rainfall amplification process after its landfall located at the edge of Guangdong,Jiangxi and Hunan Provinces.The large value regions of both the vertical divergence flux and the moist potential vorticity agree fairly well with the location of the rainfall amplification.Both of them have pretty good indicative meanings to the location of heavy rainfall,in which the vertical divergence flux is better.The moist potential vorticity indicates well not only the distribution associated with the rainfall amplification but also the distribution associated with Bilis in 2006.