Abstract: To reveal the suitable planting density of new maize variety‘Wanyu 708’, and provide a basis for the promotion and high yield of‘Wanyu 708’, tests were conducted at the experimental field of Suzhou Academy of Agriculture for two consecutive years. Six density treatments were set at 45000-90000 plants /hm2 with 7500 plants /hm2 as the density ladder, and the yields and correlated characters were analyzed. The results showed that a parabolic relation existed between yield per unit area and density. The highest yield was obtained at the density of 67480 plants/hm2, and then the decrease range of yield was small with density increasing, the yield showed a smoothly decreased trend. The yield was negatively correlated with grain number per corncob, but the relation between yield and thousand-grain weight was not significant. Therefore, the best planting density of‘Wanyu 708’is 67500 plants/hm2, and the application of corncob fertilizer under planting density increasing is an effective way to obtain high yield.