贸易弹性估算,特别是出口弹性,是迄今为止国际经济学、甚至经济学中最受关注的领域。本文从理论基础、变量、计量方法和样本选择等方面对已有文献进行了梳理,对现有国家或产业层面的贸易弹性研究进行了归纳和总结,指出各研究结果中出口贸易弹性值差异巨大,有些甚至远远偏离理论预期的原因。同时,进一步指出相关文献因为忽略企业异质性而导致的系统性偏误及其对估计结果的影响,为Krugman(1989)研究中“45°规则”的可能来源提供了一种新的解释。最后结合中国出口贸易弹性的估计,提出未来研究应该坚持的方向。 The elasticity of trade elasticity, especially the elasticity of exports, is by far the most important area of ​​international economics and even economics. In this paper, the existing literatures are reviewed from the aspects of theoretical basis, variables, measurement methods and sample selection. The existing studies on trade flexibility at the national or industrial level are summarized and summarized. The results show that there is a great difference in the elasticity of export trade among the research results , Some even far from the theoretical expectations. At the same time, it points out the systematic errors caused by ignoring the heterogeneity of enterprises and their influence on the estimation results, and provides a new kind of possible source for the rule of 45 ° in Krugman’s (1989) study Explanation. Finally, combining with the estimation of the elasticity of China’s export trade, we put forward the direction that the future research should adhere to.