Based on the features of the real estate industry, a cost model was established for analyze integration strategies. The analysis results show that a real estate enterprise should give a priority to integration of the business activities, of which the costs themselves are not large but which will greatly influence the whole project and other development business activities; and that the integration in a real estate enterprise is influenced by the product optimization degree, the business management capacity, and the degree of market competition. The integration in the real estate industry is influenced by the product optimization degree and the business management capacity, but it has nothing to do with the degree of market competition.