The condition is characterized by time beta market state space model, concept, behavior beta can adjust process depending on the variables related to the potential market in the association of Southeast Asian nations (ASEAN) will growing, and we want to know what how investors will suit this new developing market in can be used to find out what they want. This paper predicts the ability of capital asset pricing model (CAPM):There are five US sector five ASEAN member countries, 10 port.