Abstract: The development of social security systems in Central and Eastern European (CEE) countries depends on the interaction among stakeholders, such as international organizations, governments, trade unions and employers. Different international stakeholders tend to intervene in different ways and the impact of their intervention is also different. For international stakeholders, due to the pressure of applying to join the European Union and the demand for loan assistance, the European Union, the World Bank and the International Monetary Fund have had a great impact on the development of social security systems in CEE countries. OECD, ILO and WHO interfere in the development of social security systems through policy recommendations, with limited influence. For domestic stakeholders, the social partners play a limited role, but the governments always weaken the influence of the social partners on the reform of social security systems in various ways.