The earth scale change of climate has brought a new kind of natural disaster and the developed and complicated city system is holding a latent risk of expanding the damage artificially. Also people has been spoiling the health since the immense quantity of chemicals have been produced and already used in pursuit of convenience and various toxic substances have been produced unintentionally and accumulated in environment. Therefore, We need some countermeasures from the viewpoint to prevent the city environment form disaster and to manage environmental risks. So we will develop and improve a new risk management system and a disaster prevention system to preserve and create the city environment where people feel easy and sound in their life. 　 "The Games of the 29th Olympiad in 2008 are awarded to the city of Beijing."The International Olympic Committee selected the Chinese capital as the 2008 host in Friday's vote during Juan Antonio Samaranch's last IOC session as president.The attraction of staging the Games in a country which has the world's largest population, as well as huge economic potential, won the IOC's heart.Beijing defeated four other bidding cities, including Toronto and Paris, to secure the country's first-ever Olympics. Osaka was the first city to go out, and it only took one more round for Beijing to win the Olympic race.