Summary/Abstract: The work systemize and lists models of cooperation between the countries of national democracy, exactly, those who found in sphere of influence of SSSSR. Contrary to capitalist and imperialist group, national, so social block of countries was profiled since 1946. All of them developed intensive cooperation in domain of ideology, politics, economy, culture and sport. The models of cooperation were, mostly, the same, but some bilateral relations existed, so contracts. The goal was to create new socijalist society under the leadership of communists. So, Yugoslavia and Poland developed multilateral cooperation under the same patent in period from 1945 until 1948, which included signed contracts on friendship and reciprocal help, economic and trade contracts, organized visits of state delegations, jamborees and sport competitions, manifestations of common friendship, so foundation of multicultural commissions with a goal to promote cultural cooperation. For example, in accordance with the Contract on friendship and reciprocal help between Federative National Republic of Yugoslavia and Republic of Poland, signed on March 18th, 1946, on twenty years, both sides were obligated to help each other in case of Germany attack. Similar contracts, Yugoslavia signed with other countries of national democracy, also. The work observed the development of cooperation until the Resolution of Inform biro, 1948. After the conflict, the work follows forms of deterioration of relations in all spheres, from verbal incidents to break of cooperation with Communist Party of Yugoslavia, so identical judgements of Yugoslavian leadership. The answers on verbal attacks are almost the same formally. The work, in detail, observes forms of cooperation, deterioration and break of relations between Yugoslavian and Polish leadership between 1945 and 1948. Behaviour of countries of national democracy, so Poland, too, to Yugoslavian leadership, which considered it unfriendly is processed in details.
