Abstract: Understanding the influence of meteorological conditions on maize yield is an important basis for ensuring stable and high yield. The effects of meteorological conditions on the yield of Lianyu No.1 maize in North China are analyzed, based on the four-year field experimental data of different sowing dates (8 June(S1), 18 June(S2), 28 June(S3) and 8 July(S4)) conducted at Hebei Gucheng Agricultural Meteorological National Field Scientific Observation and Research Station from 2018 to 2021. The results show that the delay of sowing dates leads to the extension of growing period and changes in the meteorological conditions during the growing period. When the sowing date is delayed by 20 days, the average growth period is 2.5 days longer compared with sowed 10 days earlier, and the average air temperature from emergence to jointing stages increases by 0.7℃, while the average air temperature from milk-ripening to maturity stage decreases by 5.9℃. The average yield of Lianyu No.1 maize decreases with the delay of sowing dates, and the highest yield would be achieved when the sowing date is during 8-18 June. The key meteorological factors affecting maize yield per unit area are the daily temperature range from seedling emergence to jointing stage and the average temperature from tasseling to milk-ripening stage. The results provide a reference for scientific sowing date of Lianyu No.1 maize to ensure stable and high yield.