On some hydraulic pressure system applications in practice, single hydraulic pump drives double motors at the same time. If load torque of the two hydraulic motors in working was different, that was at the time of different system pressure, hydraulic oil would flow to the motor with the lower pressure in priority, causing rotational speed unable to meet design requirement. In order to solve this problem, a hydraulic proportional flow control valve was installed on each branch circuit of the double motors. The flow control valve was composed of connecting in series of throttle valve and relief valve of fixed difference. The parameters of the flow control valve were adjusted according to simulation values so as to solve flow changes caused by changing in pressure at throttling gate. Namely the working performance of flow control valve was not affected by changes at the load torque. Finally a simulation model of the hydraulic system is established and analyzed with the AMESim simulation software to verify parameters changes of the hydraulic system and reasonableness of design of the hydraulic circuit.