Basic theory refers to the study of the general or main laws of social and economic movements and provides a guiding theoretical basis for applied research.

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The explanation of foundation is based on buried wall foundation and column pier; The origin or starting point of the development of things in the underground part of a building: a detailed explanation of the economic base. Refers to the roots of buildings, such as rammed earth under walls and stones under columns. Li Daoyuan in the Northern Wei Dynasty's Notes on Water Classics and Channels: "Around this monument, the remains still exist, and the foundation is still there." Theoretical explanation: rationality; Follow his theory: ignore other theories: there are too many books to deal with, and the daily theory cannot be explained in detail. Comment according to reason. Cui Guangshao's Biography of Northern History: "Guangshao is knowledgeable, eloquent and especially good at theory. As for ethics and religion, between gains and losses, it is not false. "