This year, Chenzhou City will accept the review of national health city and the review of class C density control of vector biological rodents, mosquitoes, flies and cockroaches. In order to successfully pass the review of four standards, in recent days, 20 smart solar energy mosquito killers have been installed in four key areas, including the scenery belt along Chenjiang River, Beihu Park, Nanling Botanical Garden and Wuling Square, effectively reducing the density of mosquitoes and flies in key areas of the city, while beautifying the urban environment.