The technology of bag-type filling silage (referred to as bag storage technology) is a new silage technology after the overseas storage of silo and tower storage technology. It is the application of special equipment to press the chopped green feed material into the high density and fast level. In the special stretch film pouch (2.1 meters in diameter and 30 meters in length), the technique of silage is used to provide a better fermentation environment for lactic acid bacteria by utilizing the gas barrier and light shielding functions of the stretch film pouch. I stationed in 2001 to introduce experiments, demonstrations and experiments have been widely promoted in Yanqing. In order to adapt to China's national conditions, I station developed and developed its own key equipment, the bag type filling machine, which has obtained national patents, and its application and support of technology have been greatly strengthened. The overall technical advantages: can store many types of grass forage grass and leguminous grass (such as corn, sorghum, triticale, alfalfa, etc.); loss is small, not more than 1%; fermentation is complete, reliable quality; bulk silage flexibility, Can work in rainy season; good feeding effect can increase the output by 10-15%; the production cost is equal to that of cellar storage.