外国直接投资（FDI）是国际资本流动的重要形式之一。FDI的进入主要有两种形式：一种为新设投资，亦称绿地投资（Greenfield），即投资者在东道国设立新的企业；另一种为跨国并购（Cross-BoarderMergerAcquisition），亦称褐地投资，是指涉及两个以上国家的企业的合并和收购。 Foreign direct investment (FDI) is one of the most important forms of international capital flows. There are mainly two forms of FDI entry: one is a new investment, also known as Greenfield, where investors set up new businesses in the host country, and the other is Cross-Boarder Merger Acquisition, also known as brownfield Investment refers to the merger and acquisition of enterprises involved in more than two countries.