To accurately determine the boundary and embedment length of the bearing stratum of DCM pile foundation,the determination method of bearing stratum is analyzed based on the empirical relationship between the CPTu data and the soil strength.Combined with the analysis of the characteristics of piezocone penetration test curve and the method of cumulative cone tip resistance,a preliminary evaluation method is proposed for selecting the boundary value of cone tip resistance,which has been well verified in DCM pile foundation project of large area and deep thick soft soil.