Although Karl Marx never gave a clear definition nor a systematic explanation of happiness, it is obvious that we can clearly see his ideas of happiness in the theory of historical materialism, which has become the theoretical paradigm of Marxs thoughts of happiness. It is in the theoretical paradigm of historical materialism that Marx reveals: the productivity is the material force of happiness; the proletariat has to realize their own happiness by themselves, and the struggle is the realistic way to realize their happiness; happiness is a historical practice category.