The closure construction of landfill site is mainly divided into: garbage body shaping, laying of protective cloth under film, final covering of HDPE geomembrane, laying of protective cloth on film, rainwater collection and drainage system, biogas drainage and collection system, backfilling of covered soil, etc. According to different uses, landfill sites are mainly divided into: municipal solid waste landfill sites, industrial solid waste landfill sites, construction waste landfill sites, medical waste landfill sites, etc.