Abstract: In order to promote the popularization of a new japonica rice variety with high photosynthetic efficiency,this paper briefly introduced the breeding process,characteristics, yield performance,and cultivation technology of the new japonica rice variety Longhe 1 with high photosynthetic efficiency.Longhe 1 is a new japonica rice variety with high photosynthetic efficiency,which was jointly bred by the Institute of Grop Tillage and Cultivation of Heilongjiang Academy of Agricultural Sciences and the Institute of Botany of Chinese Academy of Sciences by using the pedigree method of female parent Jiudao 63 and male parent Longdao 21.From 2020 to 2021,the average yield of the regional test was 8 454.6 kg·ha^-1,which was 5.4% higher than that of the control variety;In 2021,the average yield of production test will be 8 702.0 kg·ha^-1,6.2%higher than that of the control variety Songgeng 16.On September 1,2021,Longhe 1 obtained the plant variety right application number（20211005676）;It was approved by Heilongjiang Crop Variety Approval Committee on June 20,2022.The approval number is Heishendao 20220004.The number of growing days of this variety is about 146 days,and the active accumulated temperature of ≥ 10℃ is about 2 800 ℃.