The purpose is to explore profound pure theoretical knowledge. Aristotle believes that the implementation of free education is suitable for "the value of free people" and can realize the harmonious development of wisdom, morality and body; Free education and vocational training are completely different. The former is noble and the latter is humble. He believes that the actual operation of various industries is a slave's business, which is not conducive to the development of intelligence. Aristotle also believes that although he is a free man in law, if he is addicted to narrow utilitarianism and regards learning as a reward, it will inevitably hinder the study of pure theory, which is also not free. Aristotle's distinction between free education and vocational training reflects that in ancient Greece, people of different classes and strata could only enjoy different education. Aristotle's liberal education is closely related to his philosophy and ethics. In his view, the immaterial form is the supreme master in the universe, it is the source, ultimate goal and perfection of natural existence, and only the rationality of free people can understand its mystery. The noblest, freest or most elegant thing in all undertakings is theoretical meditation and exploration, which is exactly the goal advocated by liberal education. Aristotle's thought of liberal education has a far-reaching influence on later generations.