The temporal changes in the number of major cultivars and percentage of production area for the top five cultivars were analyzed according to production area of different types of rice cultivars in Zhejiang province since 1999. Compared to 1999, Which is the former year of the Seed Law of the People's Republic of China implemented, the total number of rice cultivars applied in Zhejiang Province was almost similar since 2002, but the number of hybrid late rice combinations increased gradually, whereas the number of conventional rice cultivars except for late indica rice cultivars declined year by year. The percentage of production area of top five hybrid late indica rice combinations reduced year by year, while that of conventional late japonica rice cultivars increased gradually. The production area of hybrid late japonica rice combinations increased sharply, while that of conventional late japonica rice cultivars reduced dramatically. During the period of 1999-2013, the major  rice cultivar was replaced at least once.