Coptis teeta Wall.an endangered species is one of the original plants of traditional Chinese medicine Coptis.C.teeta and now it is listed as national Ⅱ grand protect plant.The flowering phenology,the floral syndrome,the breeding system and the pollination biology of C.teeta were studied in present paper.This study will help to reveal endangered mechanism of the plants and lay a foundation for the protection of germplasm resources and artificial tending.The main results were as follows:(1)The floral longevity of C.teeta lasts for 4 months from December to March of the next year.The flowering period of inflorescence is 45～60 days and different flowers of the same inflorescence bloom apart from 1 to 3 days.(2)C.teeta is pleiochasium,brats protect bud,flowers bisexual,stamens and carpels numerous.(3)P/O ratio is about 9 000 and OCI is 4 or 5.The results of breeding experiment demonstrated that C.teeta is xenogamous and selfcompatible,the pollinators are required for seed sets.The agamospermy do exist in C.teeta.