Low costed and slow released fertilizer of methylene urea was synthesized from urea and formaldehyde,which mixed with corn stalk power.Suitable synthesis conditions had been obtained:rate of urea and formaldehyde was 14∶1(m∶m),amount of corn stalk power was 20% of urea,addition reaction temperature was 75~80℃,addition reaction pH value was 8.5~9.0,addition reaction time was 90 min,condensation reaction temperature was 80℃,condensation reaction pH value was 4.5~5.0,and condensation reaction time was 30~45 min.The slow released property was detected through dissolved rate of methylene urea in water or simulated soil.Analysis showed that the dissolved rate of methylene urea from water was less than 25%,the dissolved rate of methylene urea from simulated soil was less than 20%.