Coated slow-release fertilizers were made by coated urea with ~(15)N using three kind of materials(WSU,FSU,GZCU) in maize.The results showed that GZCU greatly controlled the release of N in soil,the content of available-N in GZCU soil was higher in corn entire reproductive period. Sufficient nutrient could be provided in later stager of corn and could meet the need for N absorption and accumulation.Compared with urea,the output of CSFs increased by 5.5%~21.3%.The difference of economic yield between GZCU,FSU treatment and CK treatment is significant.In condition of all fertilizers were basal applied,N use ratio of CSFs is 4.5~19.3 percentage points higher than only supplied by urea.The difference of N utilization ratio between GZCU treatment and FSU treatment is significant.The same to WSU and FSU,but the difference between WSU and CK2 is not significant.