Li Gou was an important thinker in the middle North Song Dynasty and his economic thoughts took very important position in his whole thought system.Li Gou paid great attention to land problem and his thoughts on land were the core of his economic thoughts.According to social crisis from more and more serious land annexation,Li Gou put forward his opinions on land problems.His thoughts on land experienced two periods such as evenly allocating the land based on the number of persons from the angle of distribution in the first period and criticizing land annexation from the angle of production lately.Li Gou presented ideas for developing agriculture,protecting the interest of peasants and restricting land annexation such as evenly allocating the land based on the number of people,the Nine Squares System of land,increasing agricultural labors,developing arable land,limiting the land of big landlords and so on.