September 6, 1899 (, Jihai In August two days), the American John Hay note of the "open door" policy in China.

1899, U.S. Secretary of State John Hay Instructions U.S. Ambassador in Britain, Russia, Germany, France, Japan, Italy, and other countries, to host governments about China "open door" note of the policy, also known as the "Hay policies. Mainly as follows: First, States shall not interfere in his country in China's "sphere of influence" or concession investment undertakings and other interests; Second, the the cargo tariff rate of the countries within the sphere of influence in China, ship tariffs, railway transport fees with other countries equal. U.S. open door policy to the preservation of the privilege in China ease contradiction powers compete for China, and equality of opportunity, equal opportunity principles, so in contention with other countries, the United States remain free and open the Chinese market for American goods. Help coordinate the powers contradictions in China, it is recognized in national satisfactory response to the March 20, 1900, (L $ dj��.c��m) this policy because of "equal opportunity," said.