Abstract: 【Objective】By investigating the usage and residual status of plastic film in Tongliao area of Inner Mongolia,to provide reference for the reasonable usage of plastic film and the pollution control of residual film in Tongliao area.【Methods】Using the way of questionnaire and sampling in typical splots,the use and residue status of soil plastic film in Tongliao area from 2015 to 2019 were investigated and analyzed.【Results】From 2015 to 2019,the mulching area and the amount of plastic film used in Tongliao area decreased from 132 400 hm² and 6 900 tons to 66 500 hm² and 3 500 tons;in 2019,the residual amount of plastic film on chili field in Kailu County was 5.82-88.90 kg/hm²,of which,the residual amount of plastic film at 2 sites was more than 75.00 kg/hm²,which was harmful to crop growth; the residual amount of plastic film of sugarbeet in Horqin Zuoyi Middle Banner was 12.24-23.45 kg/hm²,which had little effect on the growth of crops.【Conclusion】The years of mulching and the recovery technology of plastic film are one of the important factors affecting the residual amount of plastic film.The longer the filming time,the higher the residual amount.The better the residual film recovery technology,the less the residual amount. In order to provide some reference for the use of plastic film and the recovery of residual film in Tongliao area,some countermeasures were put forward,such as source reduction,popularization and use of new standard film and alternative technology,and improvement of film recycling compensation system.

Key words: Farmland mulch, Film residue, Control strategy