Abstract: Early harvest cultivation of spring potato is a kind of method for early harvest and higher economic benefit. Tuber growth regularities of 13 potato varieties （strains） were analyzed in order to provide the basis for variety selection and identify the suitable strain for early harvest cultivation of spring potato. The results showed that the tubers of earlymaturing varieties grew fast in early stage， but slow in late stage， and the tuber yield before 55th day growth period was much better. The tubers of mediummaturing varieties grew fast both in early and late stages， but the advantage of tuber yield appeared gradually after 55th day growth period. The tubers of latematuring varieties grew slow in early stage， and a growth peak appeared on about 68th day growth period in late stage. Tuber yield was mainly related to average weight of single tuber， stem diameter， and weight and number ratios of mediumand largesized tuber. AG187 was a mediummaturing type with largesized tuber， high yield and high ratio of mediumand largesized tuber， which was very suitable for early harvest cultivation of spring potato. CG366 was an earlymaturing type with smallsized tuber， more number of tubers per plant， high ratio of smallsized tuber， and tuber yield compared with Favorita， which was very suitable to be used as smallsized tuber for early or middle stage harvest of spring potato under early harvest cultivation.

Key words: spring potato, early harvest cultivation, growth dynamics