Organic planting methods affect the yield,price and cost.At the same time,farmers have to spend lots of money gaining organic certification every year.It is an important problem that how to make farmers change their conventional technology into organic farming.If the benefit from the organic food equals or exceeds the fee of certification,farmers will employ the farming technology.It is considered that there is land limitation because of yield,cost and price.The acreage limitation is a significant factor to impact the action of farmers.Under this limitation,farmers can not use their technology.But on this limitation,farmers have alternative choice,and other factors will impact the farmers to use organic technology.