Abstract: In order to promote the popularization of high-yield rice variety in cold areas, this paper briefly introduced the breeding process, genetic relationship, variety characteristics and matching cultivation measures of Longgeng 2305. Longgeng 2305 is a new rice variety selected by the pedigree method with Longgeng 39 as the female parent and Longdun 204 as the male parent. Approved by the Approval Committee in 2020（Approval number: Heishendao 20200027）. The regional test results showed that the average yield reached 9 281.8 kg·ha^-1, an average increase of 7.9% compared with the control variety Longgeng 31 from 2017 to 2018. In 2019, the average yield at multiple points was 8 563.2 kg·ha^-1, which was 8.2% higher than that of the control variety Longgeng 31. This variety was a precocity japonica rice with main stem 11 leaves, and the whole growth period was about 130 days. It was suitable for planting in the third accumulated temperature zone of Heilongjiang Province areas which effective accumulated temperature of 2 400 ℃ or more. This variety has the characteristics of outstanding yield, compact plant type, no premature senility, strong resistance to collapse and disease.