In order to study the effect of controlled release urea on yield and nitrogen use efficiency,two field experiments were conducted to examine the rice yield,nitrogen use efficiency and soil nutrient residues under different combination of common urea and controlled release urea.The results showed that controlled release urea and common urea both significantly improved the chlorophyll content,plant height and biomass of rice,but there was no significant difference between these two treatments.The increase in rice yield under controlled release urea was lower than that under common urea,mainly due to the decrease of the number of effective panicles of rice.The combination of common urea and controlled release urea increased rice yield by 0.51~0.92 t/hm2 than single application of controlled release urea.In different ratios of common urea and controlled release urea,the treatment of controlled release urea/common urea=7∶3 was most conducive to rice growth,with the highest plant height,biomass and nitrogen use efficiency,lowest nitrogen residue and highest yield.The treatment of decreased nitrogen by 10% or 20%,significantly decreased chlorophyll content of rice leaves,nitrogen utilization efficiency,and reduced rice yields by 0.24 to 0.41 t/hm2 and 0.39 to 0.51 t/hm2,respectively.