Abstract：In order to study rock mass permeability characteristics and its mechanics and failure mechanism under high pore water pressure condition，a rock high pressure permeability testing system has been designed and produced. It can perform the test of permeability and correlative mechanics measurement studying for big size and different patterns(cylinder or square column bodies) rock mass or gravel soil under high confining pressure. The max-value of lateral pressure and permeability pressure all can be applied to 30 MPa；and the axial load can be 4 000 kN. The seepage quantity is obtained through the measurement precision of water seepage volume change quantity，which can save the test time greatly and improve the precision. On the basis of the main control devices of static servo-valve，the entry water pressure of sample can be a stable value under no computer controlled condition. The special pipeline filter and velocity adjust valve have been used to control the flow velocity in the seepage exit. When the controlled velocity equals the sample infiltration velocity，the stable water pressure can be set up，and the stable water pressure difference has been formed between the sample¢s two ends. There has the flexible computer control function，which can monitor the curve variation data and rectify the test plan at any time；and the test steps can be more satisfied than the plan demands. These systems solve the technical problem of permeability and mechanical characteristics test under high pore water pressure and low hydraulic gradient condition. Therefore，this testing system will provide a new test method for the fields such as hydropower engineering，oil and nuclear power industries，and has its significance.
