Abstract: It has been reported that corrosive running agent can speed up the running-in process,but there are no research works published with regard to the influence of corrosive running-in onsurface contact fatigue life. Based on summarlzing gear running-in technology, the testinvestigation about surface contact fatigue life after running-in with corrosive running agent hasbeen done by using JP-BD 1500 contact fatigue machine, and the reasons for increasing ability ofantifatigue wear of surface has been discussed,and then proceed to make a surface contact model.Under test conditions, the contact fatigue life of softer surface used of corrosive running agent isincreased by 70.55%than using common running oil and by 35.01%than with abrasive gearrunning agent, and the contact fatigue life of the harder surface is incrcased by 39.21%than withcommon running oil.It is shown that surface roughness after running-in used of corrosive runningagent has desce nd largely,and some little plane has been formed between surface so that the realcontact arca in crease obviously and the loeal normal load decreases largely. These decreased anddelayed the fatigue crack propagation and so increase the ability of antifatigue-wear of surface.