Five kinds of slow-released multifunctional biochar coated ureas were prepared mainly with corn strawbiochar and binder modified vegetable oil. 25 ℃ constant water dissolution rate method and corn pot cultured experi-ment was used to study the release performance of fertilizer nutrient and the fertilizer effect. The results showed thatincreasing the quality of coating layer（thickness） and adding sealant could be applied to extend the period of supply-ing nutrient. when the coating layer weight ratio were 10%, 15%, 20%, the fertilizer effective period were 8, 9 and12 days, respectively. The period can be extended 3 days by spraying sealant on the surface. Compared with ureatreatment CP1, the plant height, stem diameter and yield component of maize of coated urea treatment CP3 were bet-ter, which the maize grain yield increased by 14.6%.