ChengYun is a comprehensive trading company. Involves the trade, the hardware, the computer and so on many services. Mainly makes the export trade. The customer origin is widespread, mainly exports to South Korea, Japan and so on, the company year export amount amounts to 50-100 ten thousand US dollars. The subordinate becomes the acoustics limited company is a specialized development produces each kind of center upscale speaker, has a fever acoustic, the digital family theater as well as the ultra micro acoustic system privately operated Science and technology enterprise