The internet of things is employed to construct a network monitoring the four situations of farmland,with the purpose to build sustainable and green precision agriculture.The four situations during crop production,including crop growth,soil moisture,crop diseases & pests,and meteorological disasters,are acquired and transmitted by the low-power,low-cost,self-organized wireless communication network,which are then processed by the powerful cloud services support platform,thus provide data to the crop production management decision system.Integrated with functions of real-time crop growth monitoring,crop diseases & pests recognition and warning,disaster evaluation,this system can provide technical support for improvement in agricultural comprehensive production capacity,prevention of natural disasters as well as the development of high efficient modern agriculture.