Abstract: In order to improve soil fertility，achieve large quantity of fertilizer application organic fertilizer of 7 500 kg per hectare，complet basic farmland comprehensive control project of 20 thousands hectares，a overhead chain harrow type organic fertilizer spreader was designed.Its characteristic was large amount of fertilization，overhead chain harrow and small power output.Prototype test results proved that this machine met production needs basically，small batch of 20 were producted.They better to completed basic farmland fertilizer organic fertilizer application in operation.And it provided a strong support for comprehensive management of basic farmland in Beijing.