Xu Guangqi criticized Xiang Yu's view that "one sword is the enemy, one person does not learn, and ten thousand people are the enemy", saying: "I don't know the art of war, and I don't know the art of war." Clearly pointed out: "the first skill of practicing law." Practicing pays attention to practicality and opposes useless ostentation in actual combat, pointing out: "It is better to learn all kinds of arts at present, just get rid of the flower method and practice practicality." Even the usual military camp activities emphasize embroidery, netting hats, gambling and so on. It is forbidden to proceed from military needs, but to determine gamblers by archery, martial arts, stone throwing, distance, metatarsal wall and playing ball games.