Thailand’s tourism resources is increasingly facing homogeneous competitions with other ASEAN countries like Vietnam, Philippines and Malaysia after the running up of AEC (ASEAN Economic Community) in 2015. In consideration of the uncompetitiveness and non-excludability (at least weak rivalness and excludability) of tourism resources as public goods, how governmental regulations should be implemented to balance the development of differentiated competitiveness and the protection of primitiveness for tourism resources remains academically debatable. This article first sets theoretical analysis of different nature of tourism resources in Thailand based on the division of public good theory. Then it uses BCG Matrix and other indexes to analyze the consumption structures of ASEAN inbound tourism in Thailand and development trends of homogeneous competition with other ASEAN countries. Furthermore, it give some cases to analyze the dilemmas in which different tourism public goods faced under the context of regulations. To end with, this article implies how governments should do to maintain the balance between differentiated competitiveness and primitiveness under regulation for targeted consumers in target regions of Thailand, which could be learnt by China to further boost its tourism development and environment sustainability at the same time.