In order to reveal the relation between the N levels,density and tobacco yield and quality,two factors and five level trails were conducted at Kaiyang.The results showed that along with the rise of fertilization level,the leaves at various positions of the plant lengthened and broadened,hence the yield and average price increased.The quality was the best at the medium fertilization leve1. Along with the rise of density,the yield and average price increased,but the main stems became thinner,internodes longer,1eaves smaller,hence the quality decreased slightly.Under the condition of mid-1ow fertility,the combination of the fertilization amount and density ratio of 6-7kg pure N per 666.7 m² and 1000 plants per 666.7 m² was optimum so as to give consideration to the yield,quality and efficiency.