Macroeconomics is the science that studies the behavior of the economy. It examines the forces that simultaneously affect companies, consumers and workers as opposed to microeconomics that studies the behavior of individuals, households, businesses and industries. Macroeconomics and microeconomics have different courses of study. Macroeconomics is the study and analysis of national production, employment, general level of prices and foreign trade. The objectives of macroeconomic policy are high and growing level of production and high rate of economic growth, high employment with low involuntary unemployment and price stability or a slight increase in the price level. The first part will be defined and explained in detail the national accounts as well as system of national accounts and national accounts in general and national accounts in the Republic of Croatia. After that detail will show the real gross domestic product (the work of GDP). When we speak of production as a goal of macroeconomic policy can be said that the BPD the most comprehensive measure of total output of an economy. It is a measure of the market value of all final goods and services produced in a country. At the end of the paper through charts and pictures are shown of GDP of the European Union, and the Croatian.