在当今开放的世界经济中 ,一国经济的繁荣或萧条会通过各种传导机制传送给他国并引起他国相应地产生繁荣或萧条 ,我们称这种效应为溢出效应。本文通过对开放经济条件下简单的凯恩斯模型研究 ,得出美国经济对中国经济的溢出效应为 :美国经济增长或下降 1个百分点 ,将导致中国经济增长或下降 0 .0 95个百分点。这与现实基本相符 ,据此提出我国应更好地实行市场多元化战略 ,积极调整出口商品结构 ,依靠扩大内需等来降低美国经济对我国经济溢出的负效应的影响 In today’s open world economy, the prosperity or depression of a country’s economy can be transmitted to other countries through various transmission mechanisms and cause other countries to generate prosperity or depression accordingly. We call this effect an overflow effect. Through the study of the simple Keynesian model in the open economy, this paper draws the conclusion that the spillover effect of the U.S. economy on China’s economy is as follows: When the U.S. economy increases or decreases by 1 percentage point, it will lead to a 0.95 percentage point increase or decrease of China’s economy. This basically accords with the reality, and thus suggests that our country should better implement the strategy of market diversification, actively adjust the structure of export commodities and reduce the negative impact of the U.S. economy on China’s economic spillover by expanding domestic demand