Abstract: There are scholars who regard the Western economics as a branch of general science to take the place ofMarxist economics. This paper holds an opposite view. As basic theories of economics always carry definite ideological bearings, so does the Western economics. It not only reflects operational features of socialized production and market economy,but also advertises the capitalist ideology. Therefore,it is necessary that the teachingof political economics not be restricted to the scope of essential relation, On the contrary, it should cover threelevels: 1, studies on the essential social and economic relations; 2, analyses of various forms of economic relations; and 3, analyses of the stimulus-restraint mechanism and behavior of the economic subject.