A kind of high speed on-off valve with valve core rotation was put forward,which could break through the restriction of spool reciprocating motion structure on the switching frequency through the spool rotation to achieve high speed switching.Based on this,the fluid model in the valve was established,and the cavitation phenomena of the valve orifice under different motion and structure parameters were numerical simulated and quantified by using Fluent software.The results show that the cavitation mainly occurs near the groove side of the valve core,and it decreases with the increase of the rotation angle;the decline rates of cavitation range and gas phase content increase with the increase of outlet pressure,when the outlet pressure is 5 MPa,the gas content decreases rapidly and tends to zero when the rotation angle is 3°;there is no obvious change in the cavitation phenomenon when the duty cycle is changed;increasing the inclination angle of the orifice port,the cavitation inhibition effect is significant and the stability of the output flow can be improved.