With the rapid development of the real estate industry, people's interest in real estate investment is increasing, and its industry value is also rising. But the real estate industry is not what people usually think, it has many branches, including the medical and health field, apartment housing field, entertainment real estate field and so on. Investment in different fields of real estate has become a major problem for people, and which field to choose for investment has become a problem for investors. This paper mainly studies the development and operation of real estate in three different fields, compares and analyzes the data of real estate enterprises in three different fields, and gives investors investment advice. This study mainly analyzes the market conditions of three companies by investigating the financial report data of three companies located in different real estate fields, calculating the leverage, WACC and beta of asset of the three companies, so as to compare the situation of different real estate fields. After calculations and data analysis, it was finally concluded that Welltower is in the best position among the three companies, but investors are still allowed to reasonably choose the companies and companies to invest in according to their own risk tolerance. These three companies are all well-run enterprises, and Welltower's data also reflects the advantages of the real estate field of health care and pension in the real estate industry, which is not only the impact of policies, but also the results of the company's own efforts.