Aiming at characteristic of double side driven of 2-position 3-way high speed on-off solenoid valve, the static characteristic of hydraulic switching half-bridge was theoretically analyzed. Based on AMESim dynamic modeling of the high speed on off solenoid valve, the static characteristic of high speed on-off solenoid valve was simulated. The reasons for nonlinear of static characteristic of high speed on-off solenoid valve were analyzed.