Abstract：A stochastic model for discontinuous jointed rock mass is presented. In the model，according to the statistical distribution function of structural surface，the spatial stochastic distribution of structural surface is simulated on the assumption that the shape of structural surface is square. The implementation approach and algorithmic reliability of the stochastic model are revealed. Through uniaxial compression simulation，the relation between strength of jointed rock mass and its influence factors such as joint obliquity and connection rate is studied under one set of diagonal joints. The computational results are compared with the theoretical value which is deduced through limit equilibrium condition to validate the stochastic joint model，and the similarities and differences between them are analyzed. Also the relationship between equivalent elastic modulus of discontinuous rock mass and connection rate of joint is studied with their influencing relation presented.
