Nowadays，gambling industry is the core industry in Macau. Approximately 80% Macau’s government financial revenues are from the gambling taxation. The Chinese tourist is one of the most important sources for Macau，but some policies from mainland China control the tourist to come to Macau，which has a great effect on the tourism and gambling industry. Actually，as we all know，the economy of Macau is developed by the tourism and gambling industry. Internationalization can help Macau to expand the market，however due to the limitations of Macau such as space and economic structure，the development of internationalization has a poor influence.

There are a few researches about the international development of Macau. This article believes international development can break the restriction of Macau’s social environment limitations，and diversified development is the vital method to improve the economic structure. Combined the PEST model and globalization as well as demography these two factors，this article constructs the GDPEST model to analysis the external environment and the trend of global development. With the benefits of the author’s working experiences in gaming industry and government，this article will try to use some theories and practices to research the obstructions of diversified development in Macau. Moreover，it is found that with the economic development of Macau，international development is an inevitable outcome and diversified development is an important method.