Abstract: Some studies have pointed out that the reasons of sports' politicization are "countries been treated as game unit" and "athletes with political identity".Based on the analysis of the existing theory,the author uses the perspective of national interest and political power to put forward a different opinion,and suggests that sports' politicization has polyphyletic reasons.Sports' influence is the footstone of sports' politicization,while national interest's sport-style rent-seeking is the root cause.And sports' organization structure is the motivation of sports' politicization.