The principle of unity is Froebel's world outlook and outlook on life, and it is also the starting point of his educational thought. He believes that the universe and everything are reasonable and orderly, and they are all governed by certain laws and rules. This thought originated from his observation of nature in childhood, developed in the study of mineralogy and nature in universities, and was influenced by other religious thoughts. In the first two paragraphs of "Human Education", Froebel said: "Everything has an eternal law that exists with the ruler …", "This all-powerful law is based on an eternal' unity', which is saturated with everything, full of vitality, life and consciousness. This unity is God. Everything comes from the unity of God, from God, and everything survives because of God's concern. This is the essence of everything. " Froebel thinks that everything is created by God, so the essence of God-divinity exists in everything, and the essence of God is the essence of everything. In other words, any life, including human life and natural life, contains some kind of "divinity", so all life contains the same quality. Everything shows a concrete image according to its own internal essence, but people are completely different from other creatures. Froebel believes that man is the spirit of all things, the man with the highest "essence of God" and the man who can rationally understand things, so man has a special mission and responsibility. Therefore, the purpose of education is to make people aware of their inner divinity, and as a god, to express this inner essence with free will-that is, to unify the inner laws. In other words, through education, children can know nature, people and finally the law of unity.