The study on suitable pregerminating conditions to obtain longer sprouts was conducted through set-ting different temperature and light condition treatment, using minitubers about 40 g of ‘Kexin 18’, one of majorcultivars in Heilongjiang Province as materials. The results showed that seed potatoes removed from storage cellarshould be placed into indoor of 24℃ under dark and wet conditions to accelerate germination. Then, when the lengthof most sprouts was more than 2.5 cm, seed potatoes was moved to the scattered light conditions for 5 to 10 days.