Abstract: Hayek absorbed the knowledge of the Kantian view, considered the rational limit and spontaneous order as the philosophical basis, and inherited the British tradition of classical liberalism, defined freedom as "Independent of the arbitrary will of others".Hayek advocated for freedom under the rule of law, and used the meta-legal doctrine to judge the rule of law as the supreme criterion standard.On the basis of the discourse of the relationship between freedom and equality, democracy, Hayek stressed that the equality and greater freedom can be protected well under the democratic rule of law, and thus demonstrated that it is necessary to limit properly the governmental power.