Under single seed precision sowing pattern and using the Spanish-type peanut variety Jihua 4 and thecommon-type peanut variety Jihua 19 as experimental material, a field experiment was conducted to study the effectof different densities on peanut seedling, plant traits and yield, and determined the appreciate density of single seedprecision sowing. The results showed that with the increase of planting density, main stem height and lateral branchlength of each variety were relatively stable, the branch number, the number of pods per plant, and pod yield perplant were decreased, and the trends of percentage of plumpness, weight of single pod, pod yield and output valuewere first increased and then decreased. The pod yield of each variety at the 180 000 plants/ha was higher than oth-er densities. Compared with the control, the yield increased by 7.73% and 8.05%, respectively, which reached avery significant level. 20.00% of fertilizer was saved. The Spanish-type peanut variety Jihua 4 got a maximum totalbenefit at the 157 500 plants/ha, compared with the control, the total benefit increased by 11.13%; but the common-type peanut variety Jihua 19 got a maximum total benefit at the 180 000 plants/ha, and the total benefit increased by11.71%. Under the conditions of single seed precision sowing of different densities, the regression equation of den-sity-yield can be concluded that the maximum yield of Jihua 4 was 4 744.18 kg/ha with corresponding density of186 900 hill/ha, and the maximum yield of Jihua 19 was 5 982.02 kg/ha, with corresponding density of 191 900hill/ha. The yield, benefit and suitable planting density of Jihua19 was higher than that of Jihua 4.