Abstract: In order to promote the maize grain mechanical harvesting in the third accumulative temperate zone of Heilongjiang Province, an experiment about cultivar selection was carried out in 852 Farm of Heilongjiang in 2021.The growth and development process, agronomic traits, grainmoisture content at harvesting was 28.0%, yield and harvest quality of different maize cultivars were analyzed. The results showed that the period of Tianhe 2 was 115 days, the lodging rate was 1.33%, grain moisture content at harvesting, yield was 10 425.8 kg·ha^-1, and the yield increased by 3.72% compared with the control. The impurity rate was 0.70%,the grain breakage rate was 4.58%, and yield loss rate was 0.67%, which were lower than the national standard of less than 2.5%（GB/T 21962-2020）.The comprehensive analysis showed that Tianhe 2 had a low lodging rate, grain moisture content, grain impure rate, grain broken rate, and a high yield.It is the suitable maize rariety for mechanical grain harvesting in the third accumulative temperate zone of Heilongjiang Province.