Civil nuclear industry has developed rapidly and made remarkable achievements all over the world since 1940s. The nuclear legal system plays an important role in promoting and guaranteeing the development of civil nuclear industry and utilization of nuclear energy. The implementation and improvement of nuclear legal system form the corresponding discipline of nuclear law. The construction of nuclear law as a new inter-discipline of both nuclear science and technology and law needs a timely follow-up. Therefore, this paper starts from the analysis of the nuclear law as a branch law and studies the nuclear law as a new inter-discipline in law. Nuclear laws is still underway and needs to be improved currently. In order to create the new inter-discipline of nuclear law, it is necessary to make clear the definition, object and characteristics of the discipline, and to design well in terms of teachers and curriculum so as to make the discipline of nuclear law more mature and realize its value as a new inter-discipline in law.