摘要：Increasing the injection pressure has been proven an effective method to enhance performance and reduce pollutant of diesel *** the increase of the injection pressure,the cavitation damage problem inside common rail fuel injector is more significant,which has direct influences on reliability of diesel *** the most studies so far have focused on cavitation occurred in injector nozzle and its atomization characteristics,few researchers studied the cavitation phenomenon in fuel injector control *** due to the complexity of flow field and difficulty of experiment,the cavitation in control valve could not be fully described by existing *** this paper,the two-dimensional visualization experiment and numerical simulation of control valve was implemented to acquire the image of cavitation intuitively and validate the simulation method and *** a new structure design of control valve named convergent model was presented for *** origin model and convergent model with different valve lifts were simulated in three *** results showed that the sheet cavitation occurred at the surface of seal cone and steel ball then turned to cloud cavitation in downstream *** intensity of cavitation increased with the increase of valve *** model could efficiently reduce the cavitation intensity near the seal *** research could provide references for engineering optimization design of control valve.