Abstract: Curtilage is an important part of agro-ecosystem.Farmers′contribution to biodiversity conservation is reflected to some degree by the number,diversity and utilization of plants in their countyards.With the involvement of Shuangshao Township Association for Protection and Utilization of Plants Genetic Resources(SAPUPGR),an investigation was carried out in Shuangqiao Village in the form of a questionnaire of participatory biodiversity appraisal on 118 households in Shuangqiao Village.The result show that there were only 67 households possessing countyard plantation,accounts for 56.7% of the total farmers investigated.There were 93 plant species in the countyards,including flowers,fruit trees,vegetables,etc.The richness and diversity of plant species are different between farmers.About 80.5% of the 67 households possessed less than nine plant species each,while 19.5% had more than 10 plant species,the latter contributing relatively greater to the conservation of plant biodiversity.It is interesting to find that courtyard plant diversity is closely related to age and education level of the householder and family size as well.

Key words: curtilage plants, plant species diversity, household, Yunnan Province