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Laminating machine is a kind of post-print equipment that presses a thin film on printing materials to improve the aesthetic and protective effect of product. The heating system is one of the important functional units of laminating machine. It has a great effect on laminating effect to select the appropriate temperature and the complement temperature performance of the system. Currently, there is a variety of heating methods of laminating machine in the market, the most common one of which is conducting oil circulation system, but the fluid properties easily change; that leads to the instability heating effects, therefore, it’s difficult to predict the results. This paper establishes the different temperature model of oil heating system, analyses and solves the surface temperature variation of heating cylinder by the finite element. In addition, it also proposes a new type of heating method, and then it makes the corresponding thermodynamic analysis.