To clarify the difference between the freedom of classical republic with modern freedom from the contest historians has been contending is the goal of essay. Furthermore we may know the transformation of American economy in early nineteenth century while the difference of the freedom between the freedom of classical republic with modern freedom could be discriminated. Self-interest, self-made and self-reliance represent the new personality of free individual are also becoming the content of modern freedom while the new commercial society gradually requires the character of competition, profit-chasing and avarice. That challenges the utopia of classical republic built on the agricultural economy.