A transient starved lubrication model was established based on the cam-tappet mechanism in order to investigate the lubrication state of the eccentric cam pair under starved condition.The pressure and the film thickness changes of six typical moments (60°,120°,180°,240°,300°,360°) in a cycle were explored,and the effects of rotational speed,initial load and oil viscosity on the lubrication state of the contact area under different cam angles were analyzed.The results show that when the cam rotates to 180°,the film thickness is the smallest,the pressure is the largest,and the starvation is the most serious.The minimum film thickness occurs when the cam rotation angle is 180° under the limited oil supply,but when the cam angle is 0 °,the speed of starvation is the fastest,the degree of starvation is deeper.When the cam rotation speed is increased,the speed of starvation is faster ,and the degree of starvation is deeper.Under the same oil supply conditions,the higher the lubricating oil viscosity,the more serious the starvation in the contact area,the speed of starvation is faster and the degree of starvation is deeper.The load has little effect on the lubrication state of the contact area,however,when the cam angle is 0°,the entrainment speed of the contact area is the largest,which can reflect the influence of the load on the lubrication state of the contact area.