Abstract: For the application of drip-irrigation engineering in the soilless substyate culture, this paper analyzes the technical and economic conditions of domestic greenhouses and plastic tunnels and the requirements of soilless culture for drip irrigation, points to adopt "the drip-irrigation system with low and natural pressure ", develops a whole set of feasible method for design and calculation, expounds the special features in overall layout and the measuring results in practical operation in accordance with this design method, discusses the selection basis of emitters, the hydraulic features of three kinds of emitters, and the contrast in their applying property. It is shown from the results that the WD-trough emitter specialized in design is most suitable for adoption and popularization.