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Study constitute of the rising-pressure system of Isostatic-Pressure, obtain the mathematic modeling of control system by theory identification, obtain the characters of mathematic model by step response method, then obtain the mathematic model. Study the infection of rising-curve controlling precision by all kinds of non-linear factor, then obtain the controlling arithmetic. Design proportional-integral controller, adjust the controller parameters by theory simulation, carry out the system-levels simulation experiment aiming at linear curve, parabola, ellipse, round and compound curve on the SIMULINK platform. As result, the compound curve is lower than 1 MPa . The result demonstrates that the proportional-integral controlling strategy can meet the wide-pressure extent and high-precision curve controlling of the rising-pressure system of WIP. 