Jointed rock mass is an important study object of engineering slope. The mechanical features of anchored jointed rock mass are studied by numerical modeling (3DEC). Taking the anchors of left bank slope of Longtan Hydropower Station in Guangxi Autonomous Region for example

the equivalent mechanical parameters of anchored jointed rock mass in the slope are deduced. Uniaxial compression test and direct shear test of rock as well as direct shear test of joint are performed by numerical modeling. The errors of results are analyzed and amended. The equivalent mechanical parameters of anchored jointed rock mass are determined that the deformation modulus

friction angle and cohesion of rock as well as friction angle of joint are the same as before while the cohesion of joint is enhanced from 50kPa to 122kPa. The final conclusions accord with the results of actual physics test. The feasibility and reliability that using numerical modeling to carry out these rock mechanics tests are verified.