Abstract：‘Longshu No.17’is a new processing potato variety．It is developed by crossing ‘L0020-14’as female parent and ‘D1533’ as male parent through sexual hybridization and systematic selection and breeding．It is of late maturity．The growth period is about 132 days．The plant has strong growth vigor．Its stem and leaves are luxuriant．The tuberzation is concentrated．The average tuber number per single plant is 5．The commercial tuber rate is 91%．The tuber is of oval shape with overlapping curve．The tuber flesh is light yellow in color．Its bud eye is shallow．The tuber is of good shape．The content of dry matter is 25.66%，that of starch is 19.16%，crude protein is 2.84%，VC is 150.9 mg·kg-1，reducing sugar is 0.128%．Its average yield is about 30 t·hm-2．Its resistance to late blight is stronger than that of the contrast‘ Longshu No.6’．It is suitable for cultivation in Linxia，Dingxi and other Eryin areas in Gansu Province．
