In order to ensure the packaging speed of cigarettes, improve production efficiency, prevent moisture absorption of cigarettes during storage or shelf life, and have a good appearance, the plastic film used for cigarette outer packaging should have good smoothness, anti-static performance, high moisture resistance, excellent shrinkage performance and optical performance. To achieve the above functions, excellent heat sealing performance is also indispensable, including a wide heat sealing range and high heat sealing strength. If the heat sealing performance of the package is poor, it is easy to have problems such as flying packages and broken packages in the packaging production line, which will affect the production efficiency of cigarettes; The low heat sealing strength of the package is likely to lead to the poor sealing performance of the overall package of cigarettes. The water vapor in the environment can easily enter the package from the poorly sealed heat sealing part. No matter how high the moisture resistance of the film material is, cigarettes are also very easy to absorb moisture, which leads to mildew and other problems; In addition, the heat sealing temperature set by different manufacturers is not exactly the same. Even if the same heat sealing temperature is set, the actual heat sealing temperature of the cigarette packaging film is different due to the difference of the heat sealing temperature control system of different cigarette packaging machines. Therefore, if the heat sealing temperature range of the cigarette packaging film is narrow, the adjustable heat sealing temperature range of the cigarette packaging machine is very narrow. When the heat sealing temperature is set slightly higher, The surface of the packaging film is prone to shrink, which affects the appearance of the packaging. A slightly lower heat sealing temperature will lead to a lower heat sealing strength of the packaging and an untight sealing. Therefore, good heat sealing performance and appropriate heat sealing parameters are the necessary conditions to ensure the reliable sealing of cigarette packets.