In order to study the disaster-causing process of hydraulic fracturing of rock mass and reveal the microscopic mechanism of hydraulic fracturing,three-dimensional analysis platform for hydraulic fracturing of rock mass is performed,using VB compilation platform,which can finish the implementation of different business soft-wares including PFC,SURFER,GAMBIT and FLUENT,and achieving data information exchange and specific functions between different software based on FORTRAN.Subsequently,the reliability of the platform is verified by establishing the same hydraulic fracturing cylinder model of rock mass as in the literature and comparing with the test results.Finally,depending on the platform,a research on crack growth of outlet tunnel is carried out to analyze the failure process of crack initiation,expansion,extension and penetration in surrounding rock under high internal water pressure.The result shows that the platform can accurately reveal the hydraulic fracturing process of tunnel lining and dynamically obtain the distribution characteristics of corresponding fracture flow field.For this tunnel model,only when the pressure of the surrounding rock outside the lining is greater than 0.6MPa can the lining of the tunnel be safe under the action of the current high-pressure internal water and this conclusion has important guiding value for the design of outlet tunnel.