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With the fast development of cryptography research and computer technology, the cryptosystems of RSA and Diffe-HelIman are getting more and more unsafe, and Elliptic Curve Cryptosystem is becoming the trend of public cryptography in the future. This paper mainly uses object-oriented technology as tools, and divides Elliptic Curve Cryptosystem into several layers, every of which corresponds a class. The properties and methods of these classes are discussed, and some methods are implemented. In the end, the advantages are analyzed, and the cryptosystem implemented with advanced programming language is easy to transplant.