Woo, Ha-yeong wrote 《Cheonilrok》 in the last Chosun dynasty. and he wrote general situation of the society those days. But, At the academic circles, This book introduced agricultural techniques. and was not introduced about the context or meaning of 《Cheonilrok》. So, I considered it’s true self of 《Cheonilrok》 that had a diagnosis and a recipe about those days, focused on book 3, 〈Guanbang〉 and book 9, 〈Jobrok〉 of 《Cheonilrok》. Although, I roughly approached that I wanted to considered about 《Cheonilrok》. 〈Guanbang, The militant Defense System〉was written to a strong defense of a nation. Woo, ha-young recognized most important to defense that advantages of a locality. And he positively emphasized application of an old castle in which a rugged land. So, he minutely explained about castle construction. And I emphasized that put a thing in good order a mountain path through an embargo of cutting and farming. Besides, There was 〈Sansuchongron〉, in 〈Guanbang〉. This was minutely explained about a mountain path and a water course of the whole country. At 〈Sansuchongron〉, he explained about a mountain path and a water course of the whole country that a mandatory matter to Guanbang. So, He made an additional remark. 〈Jobrok〉, miscellaneous notes, was introduced a series of biographies who don`t know people. And He written a foreword compiled intention that corrected the ethics of the nation and added instruction of the world. This was introduced an episode that filial piety, loyalty, chastity, stiffness, great ability. and then, This was append his opinion at the back. He introduced not only an able man of Silla, Koryo and Chosun Dynasty, but also actively introduced an able man of Song and Ming Dynasty. Specially, at 〈Jobrok〉, We was worthy of notice that related facts a relief party of Ming Dynasty at Imjinwaeran(壬辰倭亂).