Abstract: In order to accelerate the popularization and application of maize variety Heyu 25 and promote the innovation and development of early maturity maize breeding in Heilongjiang Province, this paper introduced the breeding process, characteristics and cultivation techniques of Heyu 25,and discussed the ideas of maize breeding in early maturity area of Heilongjiang Province.Heyu 25 is a single cross bred by the maize Breeding Institute of Jiamusi Branch of Heilongjiang Academy of Agricultural Sciences in 2007 from the self-selected line Heyu 628 as the female parent and the self-selected line Heyu 640 as the male parent.It is characterized by early maturity, disease resistance, high yield, strong stress resistance, rapid dehydration, high bulk density and good commodity quality.It was suitable for spreading planting in the third accumulation zone of Heilongjiang Province, and the yield reached 9 399.9 to 10 167.9 kg·ha^-1,which was 11.7% to 13.1% higher than that of nandan 13.For the third temperate zone of Heilongjiang Province in early maturity, disease resistance, resistance to dense, high yield as the goal of new maize varieties breeding, can with high density and large groups, much adversity and hybrid breeding parents, genetic recombination and complementary, additive genetic effect, combined with ecological characteristics, the actual production, varieties, application status and development trend of ecological breeding theory, multi-year multi-point test was used in variety selection to improve seed selection effect.