Most of the great philosophers known to people are from Germany. This may indicate that these German philosophers are better at summing up and developing. Heine has a poem saying that when neighboring countries pursue the sea and land, Germans are more willing to pursue the sky of ideas. From this point of view, perhaps the split pattern of Germany 187 1 years ago was a driving force for many German intellectuals to indulge in ideological interpretation. There are different opinions about the ownership of the three giants of philosophy. Here I briefly introduce a mainstream view. According to this view, these three giants are Emmanuel Kant, the founder of German classical idealism, georg wilhelm friedrich hegel, a German objective idealist and a great dialectical thinker. Karl Marx, statesman, philosopher and founder of Marxism.