Abstract: The research on biodiversity of homegarden in Yongzhao Village，Wuding County，Yunnan Province，whereall people are Yi nationality，shows that total number of biological species in homegarden is 109 of which the vegetables account for 33．0％ ．economic trees 21．1％ ．and animals 14．7％ 、The biological species have been changed with the history of our country．The frequency of planting different biological species in homegarden is different，There are 13 species of which the planting frequency is over 90％ ．Otherwise．the biological breed is very rich and the number of breed is 1～7．The species richness index is from 3．21 tO 7．67 and increases with the increase of structural layer of homegarden．