Abstract: In the past 10 years（2011-2020）, the average precipitation during the crop growth season in Lingdong Zhalantun City,Arong Banner, and Molidawa Banner of Hulunbuir City has exceeded 500 millimeters, which is very beneficial for promoting soybean and corn belt composite planting. However, the distribution of precipitation is uneven. The precipitation during the critical water period from mid July to early August is 166.7～171.5 millimeters, accounting for about 30% of the total precipitation during the growth period, which is lower than the ideal precipitation, There is a negative impact on the yield increase effect of soybean and maize belt composite planting; The total solar radiation in summer is above 1800 MJ/（m2·a）, which belongs to a region with abundant solar energy resources. The number of days with sunshine hours greater than 6 hours during the crop growth season can reach19～23 days. The lighting conditions are very favorable for promoting soybean and corn belt composite planting. Meteorological disasters such as heavy summer rainfall, hail, and periodic droughts have a significant adverse impact on soybean and corn belt composite planting.