Considering the cost,environmental impact,long term stability and the versitility,the development of the graphene based metal-free catalyst is very desirable and many efforts have been devoted in this direction.Recently,a 26-ring warped nanographene C80H30 [1],which is a new member of carbon family,was synthesized successfully.By investigation of adsorption and dissociation of oxygen molecule on the surface of warped nanographene C80H30 using density functional theory,it is found that the C80H30 is an efficient metal-free catalyst.To prove the speculation,the mechanism of C80H30 as a metal-free catalyst for CO oxidation reaction is identified by studying the diffusion of O atom on the surface of C80H30 and CO oxygen reaction process.