Abstract: Chidou 3 is a conventional variety,which was selected by cross choose breeding with female parent of public hybridization 9210-11 and male parent of Chidou 1 in Chifeng Academy of Agriclutural and Animal Husbandry Sciences.It was registered by Inner Mongolia Autonomous Region Varieties Committee in May,2011（Mongolia trial bean 3）.Chidou 3 is a mid-mature variety,it was showed high yield,stable yield and multi-resistance at all production experiment levels in 2008～2010.It is adapted planting in Chifeng City of Inner Mongolia Autonomous Region and Tongliao City where the tempreture was higher than 10℃,and accumulated temperature is higher than 2700℃.