Presently,there exist the problems such as poor consciousness on protection of variety rights of the breeding institutions,increase of seed costs,a long investigating period and difficulty in defending the variety rights.

The cultivar-right-protection for agricultural plants, belonging to the knowledge-right-protection of plant breeders, has been gaining more and more social emphasis, same did the fruit cultivar-right-protection as one of the categories of cultivar-right-protection for agricultural plants.

This paper introduces the main methods to establish the DUS (Distinctness, Uniformity, Stability) testing criteria of sweetpotato, the similarities and the differences among the relative criterions, analyzes the actuality and the problems of new varieties protection of sweetpotato in China, and puts forward measures to en.