Four fourth strategic phases: rural development and sustainable development of the combination phase of the 21st century, global resources, markets, technology competition, global climate, ecology, environmental risk ridden, political crisis, financial crisis, food crisis, the energy crisis This flared up. December 2001 China formally joined the WTO, the introduction of all-round opening policy, the economy expanding; country in natural resources, ecology, environment, population, employment, distribution and other areas of contradiction, transformation of society, the economy in transition countries Governance is also restructuring. regional economic development presents new characteristics, new situation, new challenges, new opportunities.