Ts'eng Kuofan, Kuo Sungt'ao, and Liu Rong knew each other as friends from their early years, studying “Cheng-Zhu learning”philosophy and achieving good results. However, Liu Rong has been relatively ignored. This book uses Liu Shi's documents collection, memorials, and the works of contemporaries, arranging his activities in chronological order, in order to overturn the fallacy that the scientists of the world are not capable of engaging in statecraft.