The thesis explored residential housing buyers’ perception toward environmental facilities in the area of New Taipei City. Experts’ opinions were gathered to summarize buyers’ decisional factors. Due to the increase of the average household income, housing buyers care about not only the size and compartment of a house but also the environmental facilities around a house. Some important environmental facilities include education facilities, transportation facilities, convenience facilities, entertainment facilities and medication facilities. The product of real estate is different from general goods. It has the characteristics of durability, high price and infrequent re-purchase rate. These factors are highly important in buyers’ decision making process among many other factors. The decision making process is a complex one as different buyers would take different factors into consideration. This thesis applied the technique of “Analytical Hierarchy Process” to construct a decisional structure of the buying process of residential housing. Relative weights are developed for each decisional factor in order for housing buyers to understand the general purchasing behaviors in the real estate market. The main purpose is to minimize the difficulties encountered by housing buyers in the decision making process.