Economics is usually classed as a social science. It studies the humanly economic hehavior, which is called as the choice hehavior . Human heings need to make decisios because each kind of resources is scare, and it also has competing uses. The purpose of this course is to introduce students to study the daily economic problems about consumption, production, transaction and distribution by applying the basic principle and analysis method of economics in oder to make decisions from the different alternatives. The study of economics is divided into microeconomics and macroeconomics. Microeconomics describes the relation of individual market interactions, focusing on production and consumption by the individual consumer, firm, or industry. Macroeconomics studies the behavior of variables that describe the whole economy. And it also examines the behavior of such aggregates as the price level and employment level, national income and economic growth, monetary and fiscal policy, and the function of financial intermediaries et al.