Safe city is the first step of informationization construction of modern cities, the future will further on the basis of Internet of things to digital cities, urban development and wisdom. In recently at the 2011 Beijing security technology application on the BBS, it discusses the wisdom city construction and the Internet of things technology application. China's security industry's leading enterprises CSST (China security technology co., LTD.) on the BBS discusses the five stages of its business development: traditional security, peaceful city, security system, digital city, city wisdom. Wisdom city will cover peace city and urban emergency, water and gas detection, garbage disposal, such as digital urban management, intelligent buildings, industrial and automation control, city one cartoon.