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1 Overview Air filter air filter that refers to the air pollution particles almost completely removed. Further than the air purification, air purification process applied to many industrial air pollution requirements less stringent treatment of occasions [1]. Air filtration technology is the science and technology over the past century with the development of modern industry and gradually form an integrated technology, which refers to the application of air purification equipment, control of pollution or dust particles circulating through the air filter to capture the air of suspended particulate matter, to protect the environment and human health, its air-conditioning, ventilation and dust, and other fields has been widely used. Recent years, air filtration technology in the development and the development of filter, filter mechanism of research and development and application of filtration equipment has made great progress. This paper describes recent development status of air filtration technology and the results achieved, make the air filtration technology research and development issues to be addressed. 2 filter and filter research and development 2.1 filter and filter our development and application of Filter is can be dispersed in the solid dispersion of the fluid in the isolated granule of porous materials, dispersion fluid can be gas or liquid. The types of filter media fiber filter media, porous membranes and membrane filter media. Filter determines the effectiveness and efficiency of the filtering process, which determines the development of air filtration technology. It is widely used in indoor and outdoor air quality and quality control. In addition, a new air filter in the air, circulating air handling and utilization, and environmental protection, machinery, electricity, coal, ceramic, chemical, pharmaceutical, light industry, chemical fertilizer, pesticides, food processing, port transportation, traffic and roads, and other walks of industry are subject to extensive use of filtering technology and synthetic fiber filter media. Filter production in China has developed rapidly. The early 20th century, 50s, China has not yet filter manufacturing plant, the market has not dedicated filter products; 60s gradually fiber textiles as filter medium, applied to all areas of industry, to satisfy the needs of different industries for various filter materials for different uses made of chemical fiber filter cloth with acid, alkali, high strength, smooth fibers and other characteristics; 70's did not, made of polyester cloth filter 208 filtering the birth of the first applications to promote a batch filter ; 80 years of product development in Japan has modeled a 729 polyester woven filter, filter dust and the need for needle felt filter material developed to improve the efficiency of bag filter Dust; mid-90s, Chinese scientists developed successfully coated filter, which uses a special process, the PTFE porous film composite in woven, non-woven fabric filter or glass fiber filter media on the formation of a dust filtration filter layer, to achieve a surface filter, in order to provide energy efficiency and low resistance and high-quality filter material [2,3]. Current trend filter is: (1) from two-dimensional structure of woven filter cloth to the three-dimensional structure of non-woven filter fabric development of the short slender filament woven filter cloth filter cloth to the development of the complex Continuous Twisted twist monofilament filter cloth filter cloth to the development; (2) from conventional fiber filter cloth to high performance, multi-function, the development of high-quality filter cloth, coated by a synthetic filter media to filter development [4]. Present, the majority of synthetic fiber filter media and composites manufacturing enterprises and finishing equipment is still not perfect, the product variety and performance development are subject to certain restrictions, a number of special-purpose filter material to be imported. In the future should be finishing the existing filter media, and application of composite technology, research and development of new filter media to improve the performance of domestic filter, and application to the formation of a strong product. Air filtration technology is made by different forms of filter realization of the filter air filter. To increase the effective area of the filter to optimize filter performance air filter structure has shaped the development of the original single, single board to fold or cylindrical shape, long and cylindrical, stacked disc-shaped and the matrix form [5]. High efficiency filter made the first born in 1964. The early 20th century, 80, entered the country abroad filters, which promote the development of China-made filter. In recent years, China has begun to study domestic electret electrostatic air filter [6]. The so-called electret is the long-term storage of the charge of the electrolyte material, that is, some methods used to make fibers with a long charge, use of electrostatic filters trap mechanism to improve collection efficiency. Currently, domestic production in the filter manufacturing standards and testing standards are not unified, efficient testing method is not strict, great variety and size of product specifications and other issues are not uniform; Meanwhile, microelectronics and precision machinery industries, high efficiency filter has purifying effect can not meet the requirements of [7], made sub-efficient, ultra-high efficiency filter to be developed. These problems requires the use of standard management and to increase research into ways to further improve the solution be. Often used in air filter housing, office, commercial and industrial buildings clean room, HVAC system, laser surgical operating room, air conditioners and other occasions. 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