This paper examines the empirical studies to ascertain the relationship between investment and other features such as leverage, maturity, ROA, cash flow, and size of REITs. I find that REITs which have Higher FFO growth ratio associate with greater investment, which means that if management have more cash, they could invest more project. I find that current investment is positively correlated with last-period investment. Finally, the results also show that the estimated coefficient of size is positive. The result means that big firms have greater investment than small firms. I find the relation between investment and ROA is negative in most of REITs, except REOCs. I find the relation between and investment is negative in most of REITs, except Equity REITs. The relation between and investment is negative except REOCs.