More than 200 mayors of tourism cities from 35 countries and areas worldwide signed and published an announcement in the 2008 Forum for Mayors of World Tourism Cities held in Zhengzhou to encourage the sustainable development of tourism and cities around the world.

The announcement indicated that to maintain sustainable development is an internal requirement of tourism industry development, and it should be taken as the basic precondition of a tourism city's development; and it must develop the city into an important base of new eco-civilization and must make travel an important channel to spread the concept of saving resources and protecting the environment.

It also emphasized the need to support those areas with good tourism resources under the precondition of sustainable development, to expedite the process of urbanization, and to shape a batch of tourism cities and towns with special features through developing the tourism sector.

The announcement also stressed the need: for cooperation among tourism cities worldwide, to share good experiences of excellent promotion of both tourism and cities, and to expand tourism cooperation fields to take advantage of synergy.