Abstract:The research on the core category has great importance for the development of the subject and the construction of environmental law system. Private right isn’t the core category of environmental law, so viewing the right of environment as the core category is not good for the dependency and development of environmental law and eventual solution to environmental problems. The core category of environmental law should be public environment interest, which is not about right but a kind of legal interest in essence. Only based on public environment interest and insisted on the angle of view of public interest, we can well explain all kinds of phenomenon of environmental law, and it could be possible for environmental law to prove its independency and construct its particular theory system. Eventually, environment law can really solve the environmental problems.