Abstract: Under-film dripping irrigation is a comprehensive technique that consolidates water-saving irrigation,effective fertilization and plastic film protection.With its help,after two years’ effort,we managed to solve a series of problems in Damaoqi,such as low usage efficacy of irrigation and fertilization and low outcome of potato.Experimental results show that under the new technique,we can save 165 cubic meters of water per acre.Water saving rate is 55%.We can save 6.84 kilogrammes of fertilization per acre and the saving rate is 33.5%,10 points higher than before.We can save 33 Kwh of electricity per acre and the saving rate is 34.2%.We can save 0.05 acres of field per acre and the saving rate is 5%.We can save 4 working unit per acre.We can increase the outcome by 510-594 kilogrammes and the increasing rate is 32.9%-35.5%.The cost can be cut by 715-740 yuan per acre.Not only can we achieve economic progress,but also ecological and social benefits by the application of this new technology.Therefore,it should be popularized.