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With the rapid development of Internet, the need of high availability of data services on Internet becomes more urgent. But as one of the most useful protocol on Internet, TCP protocol software can not solve the high availability due to the failure of hardware or software on server/client. In this paper, we propose a new method that can implement fault tolerance TCP to improve the high availability of data transmission. First, we analyze some existing methods of fault tolerant TCP; then based on the characteristic of present server architecture, we put forward our new method of fault tolerant TCP; and lastly, we describe in detail how to implement and test our method. Experimental results show that our fault-tolerant TCP can offer high available and high effective communication support for reliable data service on Internet.