Abstract: The mechanical properties of the granodioritic porphyry are tested by the conventional triaxial test.Based on this，the H-B empirical strength criterion is used to estimate the rock mechanical parameters，and the estimated values are verified with the results from uniaxial compressive strength test，point load strength test and stress mohr circle method，in order to obtain high accuracy rock mechanical parameters.The research results show deformation modulus E and poisson's ratio μ of granodioritic porphyry change little with the pressure variation，and it can be determined from the mean value E，μ at different lateral pressure；Uniaxial compressive strength estimation σ_c are in good agreement with the tested values，but uniaxial tensile strength estimation σ_t has large deviation from the test results；At low pressure，the estimated internal friction angles φ are consist with the value from test and Mohr circle method，but cohesive force estimation c is different from the value by Mohr circle method.Through comprehensive analysis，the mechanical parameters of granodioritic porphyry are proposed in Jinding Tungsten Mine.

Key words: Granodioritic porphyry, H-B empirical strength criterion, Rock mechanical properties, Conventional triaxial test