The marine rudder system is one of the important ship manipulative equipments， and the ships stability and safety are influenced by its performance directly. The direct drive volume control (DDVC) technology was used to overcome the disadvantages of the low efficiency and the noise of the traditional hydraulic servo system. Aimed at the performance of the direct drive volume control system in low velocity, which is affected by the friction disturbance, the volume and mechanical loss, and the torque disturbance. a model of DDVC system was established. Also the cosimulation based on AMESim/Simulink of the DDVC system under ideal conditions and low status was established to analyze the low velocity characteristics, which shows the impact of these factors on system performance. It's illustrated by simulations that the creeping and dead zone owing to the nonlinear factors affect the motion stability. The low velocity characteristics is improved by the relevant friction compensation control to diminish or eliminate the nonlinear impact.