‘Suyu No.1’ is a new bulk purple yam variety developed from‘ Zhejiangzishiyao’ through the systematic breeding method．The yam tuber is of thick and short shape，with purple brown skin and purple flesh，approximately 25 cm in length and 20 cm in circumference．It displays a medium growing period with about 155 days，and usually produces 2 yam tubers for a single plant．The yam weight of a single plant is about 1.0 kg，and anthocyanin and starch contents are 9.28‰ and 23.9%，respectively．This variety does not produce yam bulbil，and average yield is 30 t·hm^-2．This purple yam variety is suitable for open cultivation in Jiangsu Province．It is recommended to plant in the areas along the Yangtze River through mechanized operation．