Objective:Aconitum brachypodum is an endangered species from the family Ranunculaceae,which only distributes in Yunnan and Sichuan Province.Previous reports showed that there were only few mdividuals still surviving,So it was dcfmed as a critically endangered species by IUCN.Methods:Wild investigations and plot analysis were carried to test the status of populations,and using methods such as v/m ratio, negative binomial parameter(K), index of dispersion(I),Cassie index(Ca),index of clumping(m*)and index of patchiness(m*/m)to analyze the space distribution pattem of different A.brachypodum populations. Results:The result indicated that the distribution patterns of A.brachypodum populations were clumped.In the three researched populations,the pattern scale is about eight square meters.Conclusion:The evolutionary of A. brachypodum populations are becoming higher in assemble intensity.