In order to change the present situation that the rock pressure is inconsistent with instruction in the traditional triaxial loading test and traditional axial piston pump can only change flow by controlling the swash plate angle in pore water test, this paper introduces in detail a type of rock pressure compensation structure and the theoretical derivation formula of pressure compensation. On this basis, the paper uses the parallel piston pump system to achieve constant flow loading of pore

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... er to rock in the pressure chamber, gives the characteristic of double pump movement and flow, and designs overall scheme and hardware system of MSP430 MCU controller of the control system. Thus concluded that the rock stress in triaxial test with load cylinder instructions are equal and the pore water constant flow load changed the traditional swash plate plunger pump flow control of complex structure.