Abstract: On the base of the static game model between two countries' tariff policy, this paper applyies game theory, and analyzes the reasons and conditions of founding the world trade organization.It is also illuminates that under the general tendencies of worldwide economics unification and global trade liberation, carrying out worldwide free trade in the short future is not realistic and developing regional economic cooperations is seemly relatively feasible in respect that all counties are tremendously different in aspect of economics, politics, culture, etc. and most countries' foreign economics and trade policies are influenced by domestic profit groups, more and less.