With the deepening of domestic auto market competition,the inventory cycle of automobile is extended,and liquid protective film covered on car-body is complained about difficult peeling as a new problem.To address this issue,the article carries on research from three aspects:materials adjustment,site operation and the method optimization for peeling film,then analyzes their contributing factors systematically,such as easy peeling agent,film thickness,fat edges,bubbles mixed in liquid protective film,rolling brush grain and so on.Finally,the article also gives some suggestions for peeling film,in cluding optimum temperature,implementation details and the selection of chemical solvent which is used to wipe the residual film.