Abstract: To reveal the effects of different planting densities on dry matter accumulation, yield, and yield traits of medium-mature spring maize variety Guangde 5. the five density levels of Guangde 5 were taken as the object in this study, and 60 000,67 500,75 000,82 500,90 000 plants/hm^2 density were analyzed. The efteet of treatment on plant height, leaf area, dry matter accumulation, harvest index, yield, and yield traits of spring maize. The results showed that with the increase of the density, the plant height of Guangde 5 increased first and then decreased with the change trend of the single peak curve, and the plant height treated with 75 000 plants/hm^2, was the largest; the leaf area index increased gradually with the increase of the density-, and was larger. Before the trumpet stage, the difference was smalh The leaf area index under each density treatment at the beginning of the trumpet period was 90,000 plants/hm^2〉82 500 plants/hm^2〉 75 000 plants/hm^2〉67 500 plants/hm^2〉60 000 plants/hm^2;with the increase of the density-, the dry matter and population of substances gradually increased along with the growth period. The order of different planting densities on dry matter and population dry matter at different growth stages was 60 000 plants/hm^2〉67 500 plants/bm^2〉75 000 plants/hm^2〉82 500 plants/hm^2〉 and 90 000 plants/hm^2 and 75 000 plants/hm^2〉67 500 plants/hm^2〉82 500 plants/hm^2〉60 000 plants/hm^2〉90 000 plants/hm^2.The maximum grain yield and net yield of the 75 000 plants/hm^2, its value is 17 959.33 kg/hm^2 and 15 422.75 yuaan/hm^2. According to the comprehensive analysis of dry matter accunmlation, grain yield and net yield, the suitable planting density of Cuangde 5 is around 75 000 plants/hm^2.