National legislation as well as national state is ancient and actual,much more attention should be paid on it in legislative research.Being a kind of special legislation,the legislative groundwork of national legislation is lain on the particularity of national problem. Shorting of definite legislative space,the development of national legislation has been confused until promulgating legislation law provides conveniences for extricating from the historical difficult position.Nationl legislation entrusted new historical mission and valuable pursuit.The key to clarify the independent space of national legislation is defining national legislation and local legislation strictly.