中文摘要：

对各种丙交酯制备工艺，反应条件作了综述，分析了各方法存在的优缺点，提出了降低丙交酯生产成本的可能途径。

英文摘要：

This article discusses some lactide synthesis methods and condition of reaction, analyzes their advantages and disadvantages, and at last, puts forward some methods to reduce the cost of producing lactide.