Zhejiang Yuefen Technology Co., Ltd. is a professional technology service enterprise. Its business covers air quality control system, building energy-saving control system, green building energy-saving system, fresh air intelligent control system, air detection and filtration system, wireless lighting control system, integrated intelligent controller and other related fields. As an enterprise with complete intellectual property rights and overall solutions in many fields, Yuefen technology has built a returnee elite team through the national talent introduction plan, established an international advanced R & D center and laboratory, and realized the transformation from haze to fresh air purification through the new green air regeneration and circulation technology supported by the cloud platform Both the Internet of things and 5g artificial intelligence have made remarkable achievements in the field of controlling nano particles.