Abstract: Potato cv. ‘Quanyun No.3’ is a new high quality, high yield and disease resistance cultivar cross bred by Quanzhou Institute of Agricultural Sciences and Industrial Crops Institute, Yunnan Academy of Agricultural Sciences using ‘VT-1’ as female parent from Vietnam and new inbreeding line ‘NS79-12-1’ as male parent from Inner Mongolia. In March 2010 it was approved by Fujian Crop Variety Approval Committee (the approval No:Min Shen Shu 2010007). It was a mid-maturity cultivar with erect plant type and good storage durability. During potato variety regional test in Fujian Province in 2006-2008, its averaged yield was 299 212 kg·hm^-2, 11.02% higher than ‘Zihua’ as control and showed resistance to late blight. The key of successful breeding and extension of ‘Quanyun No.3’ was selection of parents having complementary advantages, preferable selection of target traits using different ecological environment, simultaneous demonstration and propagation, and creation of extension pattern.