Worldwide economic centers, Convention and exhibition industry has become the symbol of prosperity. Some secondary cities, the development of Convention and exhibition industry can also promote its overall prosperity, Germany Hanover and United States Las Vegas is. Exhibition industry from the angle of the following contributed to the prosperity of cities. First of all, its own economic space is enormous, economically developed countries of Convention and exhibition industry is worth about a third of its total GDP of about 0.2%. 2001 US $ 280 billion in direct economic benefits of the global exhibition industry, exhibition industry US $ 57.9 billion in overall economic benefits across the United States.