Abstract: Along with the increasing investment and developing in overseas markets, Chinese enterprises increasingly need to seize the opportunity to "go out", in order to make the business expand more. Therefore, Chinese enterprises need to carry out more outlets in foreign countries to meet the need in growing overseas markets. In the past, many domestic enterprises of the global wide area network(WAN) could not meet the current needs of the global Internet. Based on the characteristics of large enterprises global wide area network(WAN), this article proposed a model of global WAN construction for large enterprises, hoped to provide a global network construction reference for Chinese enterprises.