In Digital Content Industry Development and Assistance Project (DCDA), the government promotes digital game industry to create value in intellectual economy. Relevant subjects have become research directions of many academic fields. There are a variety of issues in digital game industry, such as game design, game industry analysis, game rating regulations, game consumption patterns, customer relationship, internet café, and game violence, etc. In fact, it is important for game developers to maintain players game loyalty, since players equal to their consumers and source of benefit. The purpose of this research is proposing a theory to verify the influence of virtual props trading sites to game loyalty of players. The objects of sampling aim at users who are actually engaged in online games props trading sites. A survey of 459 game players in Taiwan was conducted; research results were generated through the use of descriptive analysis, reliability analysis, correlation analysis, and T-test analysis. The framework of this research can be used to analyze the more involvement degree of virtual props sites, the additional of consumers' game loyalty. The results of this study showed that the higher involvement degree for virtual props has significant impact on the customers' loyalty.