An experiment was carried out in the paddy field to compare the effects of the different mixture rates of the coated slowrelease urea and prilled urea on the biological characteristics of the double cropping super rice and the nitrogen utilization efficiency.The results showed that in the full nitrogen applied rate(180 kg·hm-2 for early rice,225 kg·hm-2 for late rice)modes,the panicles of double cropping super rice of the treatment with the coated slowrelease urea was less than the treatment of the prilled urea,while the glumes flowers and the grain filled rate were higher than the treatment of the prilled urea,and resulted in higher grain yield and the nitrogen utilization efficiency.The yield and the nitrogen utilization efficiency of the three mixed proportion of nitrogensaving modes(144 kg·hm-2 for early rice,180 kg·hm-2 for late rice )were higher than the full nitrogen modes significantly.The grain yield and nitrogen utilization efficiency got the highest with 3∶7 proportion of the coated slowrelease urea and the prilled urea during the whole modes and was most suitable for application in the south double cropping rice area.