Abstract: The comparison analysis on floristic components of Korean pine broad-leaved secondary forest in Liangshui Nature Reserve and Maoershan Nature Reserve illustrated the difference of floristic components and the influencing factor between two nature reserves.The results showed that the latitude difference was an important factor of the floristic components difference in both areas.The latitude of Liangshui Nature Reserve was on the high side and the temperate composition occupied very large proportion.However,the latitude of Maoershan Nature Reserve was on the low side and it added a lot of floristic composition of North China and tropical,subtropical floristic composition.There were 80 family,243 genus and 441 species in Liangshui Nature Reserve,and there were 87 families,328 genus and 750 species in Maoershan Nature Reserve.In the peculiar composition,there were differences between the two nature reserves,where Maoershan Nature Reserve had more Chinese endemic species.