Abstract: In order to promote the popularization and application of a new maize variety Biandan 9,this paper briefly introduced the breeding process, variety characteristics, yield, quality, disease resistance and supporting cultivation technology of Biandan 9.Biandan 9 was a maize single cross bred by Heihe Branch of Heilongjiang Academy of Agricultural Sciences with inbred line D22 as female parent and inbred line Bianzi V93 as male parent.The number of growth days from emergence to maturity in the adaptive area was about 113 days, which needs to be ≥ 10 ℃ and the active accumulated temperature was about 2 200 ℃.The experimental results showed that Biandan 9 had good high and stable yield and wide ecological adaptability.It was suitable to be planted in the third accumulated temperate zone ≥10 ℃ and the active accumulated temperature above 2 300 ℃ in Heilongjiang Province.