Put three kinds of extreme pressure-antiwear additives(T204,T304andA88) into the same polyurea grease, the effects of three additives on tribological properties of polyurea grease have been studied respectively in this paper. The results showed that T204 could only improve significantly load-carrying capability, when the additive content of T204 was 1%, its load- carrying capability was greatly improved from 400N of base grease to 900N improved by 125%. When the additive concent of T304 was 0.5%, the wear volume of polyurea grease was reduced by 52% and its load- carrying capability was improved by 125%. When the additive concent of A88 was 1%, the wear volume of polyurea grease was reduced by 58% and its load- carrying capability was improved by 75%.