Abstract. The article presents basic principles of investments into pension funds, namely, the principles of safety, profitability and negotiability, and specific features of pension insurance in the world, such as administration of premium collection, features that are specific for rural areas and specific features of «ethical investing». It was proved that the countries that developed pension systems of a new type should use the experience of guaranteed pension payments. To overcome the financial crisis in pension provision system, it is necessary to develop new principles for renovation of the world pension markets. It was found out that use of the pay-as-you-go pension system is a vital issue for many countries on the back of the financial crisis and failure of citizens to make pension contributions. Many foreign scientists, economists, politicians have researched problems of pension system development, setting the foundation of modern pension systems in the world economies. Ukrainian scientists form the modern vision of a new pension system in Ukraine. In the sphere of social insurance both in Ukraine and all over the world, it can be stated that a pension system is an important part of the social security system of economic activity. The objective of the article is substantiation of theoretical principles and development of scientific and practical recommendations on pension insurance in terms of reforming a pension system. The role of pensions increases along with development of market relations in the countries where social, economic and political changes take place. Based on previous researches, the scheme presenting basic principles and features of pension insurance in the world has been developed. Based on the above, it can be stated that demography is an urgent problem for many countries of the world. It can be solved via higher retirement age, levelling of retirement age of men and women, higher state expenditures on pensions, etc., with due consideration of specific situation in every single country. The processes of investment of funds play an important role in implementation of pension provision principles. Investing into pension insurance funds in the capital market has some specific features and principles that should be adhered for the sake of safety, profitability and negotiability of assets. Thus, the government has to regulate and control the process of pension funds investing. Depending on the governmental policy, restrictions have to be imposed on investing into various assets. High level of inconsistency of processes in this sphere is due to internal and external factors, and it requires further research. Keywords: the pension system, pension insurance, pension provision, retirement age, social security. JEL Classification G22, G23, H55, J32 Formulas: 0; fig.: 1; tabl.: 0; bibl.: 11.