Since reform and opening,the total amount of national assets of china has increased greatly,however ,the loss of national assets is also a very serious problem.At present,the channels of loss consist of decision-maklng mistakes,enterprise bankruptcy,business management chaos,conversion of enterprise ownership system,joint venture,Sino-foreign cooperation , establishment of tertiary industry ,ignoring of the management of immaterial assets etc.and all these have led to severe loss of national assets.Aiming at the current situation of the loss of national assets,the measures of preventing the loss of national assets are proposed.