The paper introduces the main classification approaches and main content of the air filters,classifies and compares the thick,medium and tall air filters used commonly in air-conditioner systems,indicates the filters with different materials,usages and structural forms,surveys their featured indexes,and points out the selection of the air filters on different occasions.%介绍了空气过滤器主要的分类方式及其内容，对空调系统中常用的粗、中、高空气过滤器进行了分类比较，并对不同材质、用途、结构形式的过滤器进行了说明，最后概述了过滤器的特性指标，进而可以针对不同场合选用不同特点的过滤器。
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