The two factors via random design was used in this experiment.The results showed that when N application level was 90kg/hm2 and plant population was increased from 13 500 plants·hm-2 to 16 500 plants·hm-2,content of nicotine in tobacco leaves increased,while content of total nitrogen decreased,N application level was 105kg/hm2,16 500 plants·hm-2 and plant population was increased from 13 500 plants·hm-2 to 16 500 plants/hm2,content of nicotine in tobacco leaves decreased,while content of total nitrogen incr...