Abstract: In field of groundwater exploitation，radiation well has gradually replaced traditional single tube well by virtue of its large amount of water.Horizontal drilling rig is key equipment during excavation of radiation well，its performance affects efficiency of excavation of radiation well.Three new design projects were obtained through innovative design of drilling function of horizontal drilling rig for agricultural radiation well by substance-field analysis and 76 standard solutions in TRIZ.An optimal project was determined through evaluation of three projects.