Mono-component and multi-component coated controlled release fertilizers were used to check the characteristic of ammonium release in the static water treated with different temperatures and granule radii.The results showed that the release rate of ammonium increased significantly under high temperature and small granule radius.Moreover,the components of fertilizer core had a significant influence on ammonium release, because different components of fertilizer core had variable ions,which would change the saturate concentration of ammonium related with the impetus of ammonium release.The lag and linear period of ammonium release were also influenced by temperature,granule radius and components of fertilizer core.The activation energy was introduced as a sensitivity indicator of release rate change under different temperatures.The activation energy was also directly related with the granule radius and components of fertilizer core.The release profiles of coated fertilizer could be evaluated by the lag period,linear period,decay period and the activation energe,which gave new thoughts for the development and application of coated fertilizer.