Abstract: The contents of this paper are introducing briefly the intertate and defence highway sy stem in U. S. America, i. e. to be known as freeway, here refering to its generation, development, planning, standard of design, scope of facilities and source of finance, problems in construction, conditions at present, and its significations after completion in defence and transportation among the peole. The total length of freeway is only about 1% of entire mileage of highway in U. S, America, but carrys as much as 1/5 of American highway transportation in peaceful period.