Taking the 800 mm PHC pile supported by the stratum of hard clay with sand as the research object,the influence of soil resistance calculation method,soil recovery coefficient and block coefficient of pile end on pile sinking penetration is studied by using GRLWEAP piling analysis software.According to the analysis results,the long-term static resistance of soil can be calculated according to the API specification of the United States.For the clay stratum with less than 30 penetration blow numbers,the recovery coefficient is 1.5-2.0,for the clay stratum with more than 30 penetration blow numbers,the recovery coefficient is 1.0,and for the medium to dense sand stratum,the recovery coefficient is 1.20-1.12.The block coefficient of pile end ranges from 0.5 to 1.0 according to the depth of pile foundation entering the bearing stratum.The penetration calculated by this method is close to the actual pile sinking record,and the relevant calculation parameters and analysis results can provide reference for similar projects.