In this thesis, we focus on fair exchange protocols and their applications in electronic contract . the primary research is summarized as follows : characteristic and applicable scope of automatic execution protocol, arbitration protocol and arbitrament protocol are summarized 本文主要研究电子商务中的公平交换协议及其在电子合同签署方面的应用,具体的研究内容包括如下几个方面:总结自动执行协议、仲裁协议和裁决协议的特点和适用范围。