The sealing performance of the seal gasket and labyrinth ring of cigarette catching device of smoking machine is not easy to find. Through studying the definition and calculation method of the rejection rate of Cambridge filter, the seal of cigarette filter is judged by the interception rate of Cambridge filter to ensure the accurate detection data of the mainstream smoke.%吸烟机卷烟捕集器密封垫片和迷宫环密封性能好坏不易直观发现，通过研究剑桥滤片截留率的定义与计算方法，依据剑桥滤片截留率数据判断卷烟捕集器密封性，保证主流烟气的检测数据准确。
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