Abstract: Mulch film, as an important means of increasing agricultural production, has brought remarkable economic benefits, but more and more attention has been paid to plastic film pollution, The authors used field surveys and spot sampling, conducted a field survey of the main crop and the typical agricultural mulching film, on different types of soil covered 3 main crops, set up monitoring sites the sampling analysis, find out the main factors affecting the initial and variation of residual plastic film. Findings from this study, all monitoring plots in farmland soil mulch residues were lower than that in 1990s the Ministry of agriculture in 17 provinces (city) the average residue level of 60 kg/hm2 survey, did not exceed GB/T 25413-2010 "farmland mulch residue limit in film pollution value and test room" of a standard; the same cropping system when the season in different years of plastic film residue coefficient difference is not obvious, and the annual mulch residues increased; cropping system, soil type, age, film and plastic film recycling habits have great influence on the quality of plastic film residue.