隨著科技不斷地進步與網際網路的日益普及，消費者手中的智慧型手機似乎早已不限用於傳統的通話功能。作者在十幾年前就曾幻想過，如果將來出門在外身上可以只攜帶一支手機，那該有多好。沒想到當初天真爛漫的想像，轉眼幾年後便已幾乎實現。隨著相機、手電筒、地圖、筆記本、隨身聽……等等逐一被我們放進智慧型手機裡，手機已經不再只是手機。而近年來大眾開始把「錢」放進手機，許多企業也紛紛推出「結合手機與錢」這種概念的各式產品與服務。當供給端與需求端都已出現時，行動支付產業就此產生。 行動支付有許多應用與模式，本研究主要針對兩個以即時通訊應用程式為初始業務的案例―微信以及LINE進行探討。兩家案例公司都是在原有業務成長至一定規模後，開始發展新興行動支付業務，分別為：微信發展微信支付，LINE發展LINE Pay。本研究不僅透過資料瞭解這兩個案例之發展歷程、營運模式以及現況；同時藉由策略行銷4C理論架構，逐步分析這兩個案例是如何各自處理交換關係中的四個成本。 研究結果發現，歷經了差不多的光陰，兩個案例所呈現出的現況卻是天壤之別。儘管兩者因為政治環境、市場規模，以及所面對之消費者習慣上的差異，導致經營成效有所落差。不過排除這些先天因素，微信支付相較於LINE Pay，確實於各階段將4C策略執行地更加完善，並因此推動4C良性循環。LINE Pay本身對於4C架構仍有許多進步空間，本研究最終建議LINE Pay可以參考微信支付部分作法，並針對台灣市場適度調整，期許LINE Pay能順利啟動4C良性循環，為自己創造長期競爭優勢。 / With the advances of technology and the popularization of the internet, nowadays smartphones can perform several functions besides communication (e.g., camera, flashlight, map, notebook, Walkman). Moreover, people begin “putting” the money on their smartphones in recent years. Many corporations have also launched new products or services featuring the combination of mobile phone and money. As the growth of both supply and demand in the market, the mobile payment industry has gradually formed. There are many kinds of application and models in the mobile payment industry. This thesis concentrates the attention on two instant messaging companies―WeChat and LINE. Both companies began expanding mobile payment business―WeChat Pay and LINE Pay―after their original business grew mature. This thesis not only reviews the development history and business models of two companies, but also uses the 4C analysis framework to analyze how they dealt with the four transaction costs. The study shows that the operating results of WeChat Pay and LINE Pay are very different. There is still room for LINE Pay to grow. Although WeChat Pay and LINE Pay face quite distinct political environment, market size, and consumers, the thesis suggests that LINE pay can refer to the strategies and methods of WeChat Pay, and make some adjustments so as to successfully create the positive 4C cycle and long-term competitive advantage.