The research “Portfolio Structure Planning and Its Future Price Forecasting Model” describesmethods which can help to evaluate and choose more optimal and effective decisions, linked with partici-pation in the stock market activity. The new forecasting and decision-making model, based on classic andproven earlier methodology, was created. Its aim is to make the decision-making process easier as well asto ease the investment portfolio optimal structure determination. The efficiency of the model was checkedon practice and the results of the new model were compared with previous ones in order to check the hy-pothesis. The main question solved in the research is a problem of making a choice and realization ofstock, investment environment and portfolio structure analysis and evaluation. The most popular modelsand its actualized variants, which are helping stock market participants to improve decision-making pro-cess, especially under conditions of instability and risk, are described in this research.