隨著電腦技術的進步以及電腦網路的普及，愈來愈多企業体系利用電腦網路來做資訊交換,以達到商業交易或工廠控制的目的，而網路傳輸狀況難以預測,若在資料傳輸過程中發生資料遺失,小則造成資料不對,大則造成應用系統無法正常運作,現今工商業對網路應用的依賴度愈來愈大,稍有閃失,都有可能招致莫大的損失, TCP/IP協定是目前網際網路上最被廣泛使用的通訊協定，而目前使用者對其服務品質的要求也愈來愈嚴格，因此，如何在現有的網路下避免資料遺失及提高通訊品質，就是本篇論文所要探討的課題。

　　本篇論文針對TCP/IP通信技術深入研究，並且建構一套以應用層通信協定為基礎的通信架構。此架構企圖以應用層通信協定實現高可靠性之資料傳輸，解決因應用程式處理不當,或對TCP/IP特性不甚了解,而造成資料遺失問題；並且，以最精簡的架構來設計應用層通信協定，讓通信程式得以輕易的撰寫並確保資料正確無誤到達對方應用程式。

　　Due to the development of computer and the popularization of Internet, more and more enterprises have adopted the computer network for the data communication to achieve the commercial business transaction or factory control. However, the data transmission in network is complicated and unforeknown. Thus, it will get some problems or affect the system operation if data are lost during the data transmission. The TCP/IP protocol is currently one of the most popular communication protocols. And the service quality from user request will be higher and higher. Therefore, How to provide the high–quality data communication and avoid the data loss is the goal of this thesis.

　　In this thesis, we focus on the TCP/IP communication technology and propose one application layer data communication protocol. Based on the application layer communication protocol, we can solve the data loss problem caused from application program or from TCP/IP protocol. In addition, we design the application layer communication protocol as simple as possible. That will make the program design easy and ensure the data reach ability to the remote side correctly.

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