Abstract: ‘Sugan 20’ is an overwintering spring early-maturing cabbage hybrid which developed by crossing self-incompatible lines ‘Y9805’ and ‘99132’. The overwintering growth period is about 145 days. It is tolerant to cold，and premature bolting. The expansion is about 49.9 cm × 50.3 cm. The growth is strong，the leaves are pale green，wax powder is secondary，the head is bovine heart-shaped，average head weight is about 1.0 kg，with tender leaves and good quality. The yield is about45 000 kg · hm^-2. It is suitable to be cultivated in the south of China，especially the Yangtze River.

Key words: cabbage, Brassica oleracea var. capitata, overwinter, cultivar