Marx and Engels discussed love discourse, news discourse, scientific discourse, spiritual discourse and other discourse contents in their poems, papers and letters. These discourses constitute Marx and Engels’ discourse theory with the characteristics of practice, emotion, popularity and truth. The essence of discourse re? veals that it is a product emerging from social productive activities. Marx and Engels’discourse theory presents an entire picture of the organic integration of their language, thought and discourse, which provides a scientific and theoretical guidance for the study of discourse.