This dissertation mainly describes following issues: 1.What is virtual property? 2.What are the legal relationships on virtual propriety? 3.How to protect virtual propriety? The virtual propriety mentions in this dissertation includes e-mail account, domain name, online-game account, etc. The ownership of virtual propriety is belong to the ICP(Internet Content Provider), meanwhile, the users take possession of virtual propriety, they are able to use it. From the perspective of civil law, users’ right could be protected under possession, their relationship with ICP contains both creditor’s rights and debt obligation. From the perspective of criminal law, under the circumstance of not modifying the law and the principal of legally prescribed punishment for a specified, stealing virtual propriety might be convicted under computer crime.