Ji Kang believed in Laozi and Zhuangzi in political thought, rejected the Six Classics, emphasized the opposition between Confucianism and nature, and advocated breaking the shackles of etiquette and law. His philosophy is based on the materialistic view of nature and adheres to the simple materialistic epistemology. He believes that "the vitality of Taoism endows all beings with innate qualities" ("On Ming Dan") and affirms that everything is endowed with vitality. Put forward the theory that "the more famous you teach, the more natural you are". Ji Kang was smart and studious since childhood. His article is "novel in thought and often against Gu Yan" (Lu Xun's The Relationship between Wei and Jin Manners and Articles and Medicinal Liquor). Breaking up with Shan Juyuan and Learning from Nature are his representative works. Poetry is longer than four words, with a clear expression; Complaining about poetry, giving scholars to join the army, is famous far and near. The theory of sound without sorrow and music thinks that the same music can arouse different feelings, and asserts that music itself has no distinction between sorrow and music, but its purpose is to deny the educational thought of etiquette and music promoted by the rulers at that time. He is good at guqin, famous for playing Guangling San, and once wrote Fu Qin, giving a detailed and vivid description of the playing method and expressive force of guqin.