中文摘要：

改革开放以来,随着贸易的快速增长,我国的城乡收入差距呈逐步扩大趋势,表明二者之间存在相互作用的关系。以30个省（市区）为横截单元,以1985-2008年的时序数据组成综列数据,研究贸易作用于城乡收入差的机制。研究发现,贸易是促进我国城乡收入差距扩大的重要因素,其起作用的方式不但与地区差异有关,而且与不同地区经济发展的性质相关。

英文摘要：

With the rapid growth of China＇s foreign trade since the opening-up and reform, the income gap between urban and rural areas presents gradual expanding tendency. By using the panel data of 30 provinces from 1985 to 2008, this paper studies on the effects mechanism of trade on the income gap. The research discoveries that the trade as an important factor promotes the income gap expanding. The effective way is related to not only the regional differences, but the nature of economic development in different regions.