The Medical Security Law has been included in the legislative work plan of the Standing Committee of the National People’s Congress in 2021, its legislative positioning is the primary issue, which concerns the distinction between the law and other departmental laws, and also determines the object of legislative adjustment and the structure of the system. In the integration of medical security with medical and pharmaceutical legal systems, the independent “sub-system” status of medical security law in social security legal system should not only be clarified, but also at the intersection of historical changes and reality of China’s medical security legal system, the status of “basic law” of medical security Law should be determined. And based on the structural and functional defects of the current medical security legal system, the functional orientation of “general rules of the Medical Security Law” should be clarified. The system of the Medical Security Law should be construct around the rights of national medical security, with the basic medical insurance as the foundation, and with the legal relationship of basic medical insurance as the internal logic to develop the standard system.