Abstract: In order to screen suitable green manure crops for planting in Heilongjiang Province that have good intercropping effects with maize, this experiment selected six types of manure crops, including red adzuki beans, peas, soybeans, common vetch, villose vetch, and oil radish, to intercrop with maize in Hailun City, Heilongjiang Province in 2023, investigated the changes in soil available nutrients and aboveground biomass yield under intercropping mode. The results showed that planting green manure can promote the growth of subsequent crop maize and had a significant improvement effect on soil nutrients. The effects of intercropping maize with different green manure on maize yield and soil nutrients vary. The optimal combination of intercropping villose vetch with maize was found to have a fresh aboveground weight of 37 234.57 kg·ha^-1, a dry aboveground weight of 5 219.8 kg·ha^-1, and a maize grain yield of 10 461.54 kg·ha^-1, an increase of 3.03% compared to the control; The economic benefit was 10 424.00 yuan ·ha^-1, an increase of 0.70% in income compared to the control group; The intercropping of peas and maize significantly improved soil quality（0-20 cm）, with organic matter, total nitrogen, total potassium, pH, hydrolysable nitrogen, available phosphorus, and available potassium at 58.60 g·kg^-1,0.25%,2.55%,6.42,223.30 mg·kg^-1,45.00 mg·kg^-1 and 251.00 mg·kg^-1 respectively, increased by 11%, 9%, 2%,3%,1%,78% and 15% compared to the control group.