Thailand is the 13th automotive manufacturer, and it is also the important part and component manufacturer in the world. After 2000, Toyota and GM established the R&D Centre and Production Base in Thailand. Now, Thailand has become ¡§Detroit of Asia.¡¨ How could we find the developmental model of Thailand automotive industry? Maybe it cannot be explained by one theory. So we try to select three theories, different ideology, to find the path of industrial development in three periods. Finally, we find the path of automotive industrial development in Thailand. Triple Alliance of dependency development theory let the industry updrade and become more and more important. And then, international division let Thailand became the key role of supply chain in the world. Laissez faire and compare advantage are the characteristics in this period, so we know the developmental model of neo-classical economic theory let Thailand shining in the world.