In German Ideology, Marx discussed the origin and development of ideology around social power. Ideology comes from the alienation of perceptual consciousness produced in people's material communication. It and social power are the two results of spontaneous division of labor, which are inseparable. Therefore, ideology is essentially the conceptual expression of the social power relationship between people. Although Marx did not clearly put forward the relationship between ideology and the reproduction of social power, ideology is rooted in people's social existence. On the one hand, it changes people's activities, on the other hand, it is also changed by activities. Therefore, ideology can be understood as a means of maintaining and reproducing the social power of the ruling class. The purpose of Marx's clarification of ideology is to criticize the concept and category ideology that has cleaned the perceptual power, reveal the social power relationship it covers, let history show its original face without a priori, and finally, the current ideological shackles can be broken through realistic movement.