Li Chengqian, who has modern scientific thinking, became the prince in the early years of Zhenguan. Faced with internal and external troubles - there were only three months left before the Weishui Alliance, and Jieli Khan's 150,000 cavalry pressed on the border, but he did not rest on ease. He used history as a guide to provide advice and predict the Turks' movements. He went to the workshop to improve horseshoes and saddles and stirrups to strengthen the cavalry's combat power, and used incendiary pots and catapults to set up defensive traps. He also predicted the locust plague and implemented grain storage strategies to save the people in Guanzhong. He prepared medicinal diets to protect the eldest queen, Sun, to stabilize the harem. He collaborated with Xue Yantuo to divide the Turks, and Chuangge Institute of Physics turned mechanical knowledge into technical weapons such as crossbows and dams. He rewrote the humiliation of the Wei River Alliance, conquered the Turks in the north, managed the Western Regions, and sailed across the ocean. He reshaped the pattern of the times with precision calculations and technological breakthroughs, assisted Li Shimin in achieving the reputation of "Khan of Heaven", and promoted the Tang Dynasty to glory.
