Abstract: ‘Yun Castor No.4’and‘Yun Castor No.5’are high-yielding, high-quality and high-resistance new varieties bred by the Institute of Industrial Crops of Yunnan Academy of Agricultural Sciences. The growth period of the two varieties was 148 days and 166 days respectively from the emergence to the main spike. In 2003, their average seed yield was 2993.55 and 2445.15 kg/hm2 respectively, which was higher than that of the control‘TCO- 202’by 48.40% and 21.27% . In 2014, it participated in the emonstration test of castor varieties in China.‘A131’was the second in Tongliao test spot and the second in Yunnan test spot.‘A133’ was the sixth in Tongliao test spot and the first in Yunnan test spot. The main characteristics of the two varieties are wax powder on stems and leaves, more branching, large ears, high yield and high oil content (57.53% and 56.66%, respectively), high ricinoleic acid (86.52% and 90.45%), disease-resistant, droughtresistant and wide adaptability. In Yunnan as well as other regions in southwest China, and Southeast Asian countries, the demonstration of castor production is very good. In 2015, a field identification was carried out on ‘A131’and‘A133’by the Seed Management Station in Yunnan Province, and the two varieties are named as ‘Yun Castor No.4’and‘Yun Castor No.5’. The varieties with supporting cultivation techniques have obvious economic and social benefits, they are suitable for planting in areas below 1800 m altitude in Yunnan Province and being promoted in southwest China and Southeast Asian countries.