The management of investment activity includes the development of investment policy, the investment project management and the developing of investment activity mechanism. The mechanism of investment activity management represents the system that includes: the market adjustment of enterprise’s investment activity mechanism; the state and low regulation of investment activity in enterprises. The mechanism of investment activity management is implementing through such functions: the function of mechanism as a regulated system; the function of mechanism as special area of operation of an enterprise. The first function has a general character and includes the next aspects: the development of enterprise’s investment strategy; the creation of organized structures, that provide decision making and implementation of these decisions; the forming of efficient information systems, that provide feasibility report of alternative variants of investments decisions; the analyzing of different aspects of investment activity; the planning of investment activity; the priming of investment decisions implementing; the implement of managerial decision controlling in the area of investment activity. The second function is specific and means boats the management real investment and the management financial investment. The factors of development of management investment activity mechanism are: providing sufficient investment support of investment activity development; the maximization from some real and financial investments risk; the optimization of investment liquidity; the supplying of financial resources.