Roosevelt's "New Deal" measures, the ultimate goal is to expand national capital, in order to overcome the economic crisis and consolidate the capitalist system. The "New Deal" is an experimental therapy that he tried to treat diseases in capitalist society when conventional therapy failed. In fact, some measures of the "New Deal" also have shortcomings, which often become the reason for his political opponents to attack. During the implementation of the "New Deal", the classes whose interests were damaged also resisted and vilified. Even the Industrial Recovery Act and two other bills, which were important contents in the early days of the New Deal, were ruled unconstitutional by the Supreme Court two years later. However, as long as we really look at the "New Deal" with the attitude of historical materialism, it is not difficult to see that the "New Deal" has kept the pulse of American economic and social life, and the slogan of "getting people back to work and revitalizing our enterprises" conforms to the interests of the broad masses of working people and fully mobilizes their enthusiasm. Roosevelt took it as the government's responsibility to maintain the normal operation of the national economy and ensure citizens' employment, especially a large number of engineering projects built in the form of work for relief, which not only greatly eased the unemployment difficulties and stimulated the early recovery of the economy, but also benefited the American economy from many infrastructure construction. The New Deal left many measures and policies to prevent the recurrence of the Great Depression, which laid a solid foundation for the United States to enter World War II and its rapid rise after the war. Therefore, Roosevelt became the most popular president in the United States and the world since abraham lincoln, and will go down in history forever.