In this paper, the life cycle of livestock and poultry farming is divided into six stages: feed crop planting, feed processing, livestock and poultry raising, manure treatment, slaughter and transportation. The specific life cycle process of livestock and poultry breeding is shown in Figure 2-1. Due to the lack of some data and the limitations of basic conditions, the production, transportation and use of pesticides, mulch and feed additives have not been analyzed, and the environmental impact caused by other related infrastructure construction, transport production and labor costs is no longer considered.