Assimilation is an important process in biological metabolism [1]. Its function is to recombine digested nutrients, form organic matter and store energy. Because the material elements in food are stored in the body, it is called "assimilation". The types of assimilation include autotrophic and heterotrophic. Biology can be divided into autotrophs and heterotrophs by assimilation. Autotrophic organisms: organisms that can synthesize their own organic matter from inorganic substances belong to autotrophs. Such as cyanobacteria, nitrifying bacteria and green plants. Heterotrophs: Organisms that can only ingest ready-made organic matter from outside belong to heterotrophs. Such as most animals and fungi. Generally speaking, digestion is a typical example of assimilation. The same is true of photosynthesis, because in this process, plants use carbon dioxide and sunlight to make their own food (organic molecules) and store these organic molecules in the plants themselves. Generally speaking, all higher plants and some lower plants, as well as a small number of bacteria can carry out photosynthesis. Assimilation is one of the important concepts in sociology and other disciplines. Assimilation is a physiological concept, which refers to the digestion process of food in the body. Sociology borrows this concept, which refers to the gradual or slow process in which different cultural units merge into a homogeneous cultural unit. Compared with alienation, assimilation is to turn non-ego into self; Alienation, on the contrary, turns itself into a non-ego.

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