This article introduces the working principle of EDI, the communication way among EDI systems and comparison of various communication ways. The choice ground of the third - party networks is stressed.

• 先对电子数据交换（EDI）的工作原理进行了简单的回顾，进而介绍了多个EDI系统之间的通讯方式和各种通讯方式的比较，并着重介绍了第三方网络的选择依据。