In order to increase the early decision-making accuracy of the real estate development and lower the overall risk of real estate investment, this paper explored the locations for projects of real estate development in the aspects of theoretical methods and technical levels. The evaluation system of housing project sites was established. It constructed the set model for real estate development projects and studied the concrete operation of the model in practice with a prac- tical example with the rough set theory. The test results showed that the method can reduce impacts from the experience and subjective awareness of decision-makers and increase the accuracy of location decisions.