The basic provisions and the content of economic analysis in the process of investment activities of enterprises and organizations. The article reveals the concept and content of investment and investment activity, considers the main tools of economic calculations and justifications during the investment analysis, methods of analysis of the investment market, forms and methods for determining, calculating and analyzing the economic efficiency of investment projects, sources of financial support for investments and evaluation of their value, portfolio management, the content of business plans of investment projects, methods and forms of state regulation of investment activity and legal protection of investments.