服務貿易「模式四」涉及生產要素之一的勞動力跨境移動，其所能帶來之貿易利得相當可觀；然而，勞動力之移動向來不為地主國青睞，各國針對此等自然人服務提供者多所管制，造成模式四貿易之諸多障礙，致使模式四佔服務貿易總量之比例極低，而亟待開發。在盤點多邊與非多邊體制下WTO之GATS與TPP協定消弭模式四貿易障礙之成果後，本文發現，國際間對於模式四貿易障礙之消弭必須持續推動，方能早日獲致模式四貿易自由化附隨之經濟利益。奠基於上述多邊與非多邊體制之成果，本文提出未來國際間在持續消弭模式四貿易障礙之可行方向，並以現正如火如荼談判中之「服務貿易協定（TiSA）」為例，印證本文所建議之方向有其可行性。 / Mode 4 of trade in services entails the cross border movement of one of the factors of production: labor. The potential gains from labor mobility can be substantial; however, labor mobility has never been welcome. Numerous regulations imposed by the receiving countries on the natural persons as service suppliers create barriers to the Mode 4 trade, resulting in the fact that Mode 4 trade accounts for little proportion of all four modes of service supply. After conducting stock takes on the elimination results of Mode 4 trade barriers through the GATS and the TPP Agreement respectively under multilateral and non-multilateral trade regimes, this article argues that efforts to remove Mode 4 trade impediments should continue in order that the ensuing welfare gains from Mode 4 trade liberalization can ultimately be achieved. Based on the aforementioned elimination results under both multilateral and non-multilateral regimes, this article proposes several approaches to further elimination of Mode 4 trade barriers, taking the ongoing Trade in Services Agreement (TiSA) as an example to verify the feasibility of the proposed approaches.