It is of great necessary to establish a scientific selection criteria for constructing Chinese national park system. On a basic of a systematic summary of selection criteria of international national park, this paper firstly concluded general technical procedures and methods that were widely used worldwide. Then, a method named as "progressive evaluation" which was appropriate for Chinese conditions was proposed. Essentially, progressive evaluation that is carrying out "evaluation for all and comparison between types" could be great helpful for identifying potential and possible region to be national park candidate. the results of this paper were as follows:firstly, national park in China played important roles in promoting the reform of management systems of natural protected areas, the transformation of the utilization modes of natural cultural resources, and also, it played in balancing relationship among natural ecological protection, resource utilization, and regional development. Secondly, since international national parks could be divided into geographical vast territory type, restricted territory type, and local feature protection type according to their differences in stratification, peer comparison, and program complexity. Therefore, it is strongly recommended that national park in china should be similar to vast territory type from international cases, and the selection criteria of this type of national park in China could include six aspects of natural ecosystem types (representativeness and importance), ecosystem authenticity, biodiversity, natural landscape, and cultural heritage. By doing so, the potential and possible national park candidate in China could be scientifically identified, which would be references for future relevant study and scientific management practice.