In order to define the relations between the nitrogen level and soybean production, and determine the best level of nitrogen. By means of narrow row close planing mode and different nitrogen levels, with the ‘Henong60’ as the research object, discussed the influence of different nitrogen levels on the yield factor and plant trait of soybean, and analyzed the economic benefit. The results showed that: the higest yield was 273.4 g/m2 of N2P1K1 treatment, nitrogen was also evident effects on plant height, the highest plant height was 83.4 cm of N3P1K1 treatment. The height of bottom pods also increased at 36.1 cm. Therefore, when the content of phosphate and potash fertilizer were fixed in a certain range, with more nitrogen helped to increase yield and economic benefit. From analysiing production and economic benefit, the experiment N2P1K1 was the best treatment.