The nonlinear contact problem of the involute profile teeth meshing of a large modulus straight tooth was studied based nonlinear concept.The precise Pro/E 3D parametric solid model was established based on the analysis of related factors affected the contact strength in a large modulus tooth meshing process.Teeth meshing static and dynamic strength were analyzed in utilizing the mechanics analysis module of the ABAQUS,the tooth surface contact stress distribution was gotten,and were compared with the Hertz theory calculations.The results show that the results of errors between the finite element methods(FEM)derived in the ABAQUS of large modulus teeth meshing contact stress distribution of the calculated results with these theoretical calculations are within the allowable range,which can be the calculation basis as large modulus gear rack and pinion meshing strength.