The four great inventions of papermaking, movable type printing, gunpowder and compass not only played a greater role in China's economy, military affairs and culture, but also had a great influence in some western countries during the transition from feudal society to capitalist society, because it was a necessary prerequisite for the development of the European bourgeoisie. As Marx pointed out, "gunpowder and compass, printing" three great inventions foreshadowed the arrival of bourgeois society. The gunpowder knight's fried compass opened the world market and established a colony, while printing became a tool of Protestantism, generally speaking, it became the most powerful lever and a necessary prerequisite for the spiritual development of scientific rejuvenation. Bacon, the originator of modern experimental scientists, once said in the book "New Tools": "If you want to see the power of various inventions, the most obvious examples are the newly invented printing, gunpowder and compass, because these three things have changed the whole face. The first time, in the literature, in the war, the second and third voyage. Judging from the countless subsequent changes, this change is so great that an empire, a school of thought and a famous figure can produce more power and influence in the cause of mankind than the three major inventions.