Phosphate coated urea (PCU) with a ttotal N content of 33.8%, total P content of 5.15% and available P content of 4.10% was prepared and used in pot and field experiments in comparison with the commercial slow-release fertilizers including sulfur coated urea (SCU),isobntylidene diurea (IBDU) and urea supergranule (USG) under rice-wheat rotation system. The results obtained are summarized as follows:(1) PCU and USG applied in holes as basal fertilizer in pot experiment was markedly higher in supplying intensity and capacity of N than SCU and-IBDU mixed with soil as basal fertilizer during the growing period from transplanting to milky ripening stage of rice, which indicates that the supplying process of N from PCU applied in hole as basal fertilizer well coincides with the requirement of N by rice plant im different growing stages. (2) Effect of PCU deeply applied as basal fertilizer on the yield of middle rice was significantly higher than that of common urea by split application, but it on the yield of single late rice on permeable and bleached paddy soils was lower than that of eommon urea of split application. The effect of slow-release fertilizer on wheat yield in pot experiment was more significant than that on rice yield, but no difference was found in field experiment.(3) PCU applied in holes as basal fertilizer for middle rice on red earth was the highest in recovery rate of N, amounting to 79%;and the recovery rates of N from USG, SCU and common urea were 60%, 42% and 34% respectively. The recovery rates of N from the slowerelease fertilizers by single late rice were lower, while that by wheat was higher than that by rice;and the results obtained in pot experiment was higher than those in field experiment.(4) The residual effect of IBDU with the lowest release rate of N was higher by 89% and 47% than those of PCU and SCU respectively, which implies that the residual effect of the fertilizers is related with the release rate of the fertilizers. It was also found that the residual effect of the fertilizers in pot experiment was significantly higher than that obtained in field experiment.