In order to analyze the influence of compressive stress on the frost resistance of concrete,the axial pressure with the stress ratio of 0,0. 4,0. 5 and 0. 6 was applied on C45 concrete with the non bonded prestressed concrete structure. The standard fast freezing-thawing test was performed,and the changes of mass loss,dynamic elastic modulus and compressive strength were measured at every 50 cycle times. The results showthat when the stress ratio is 0,the mass loss and dynamic elastic modulus drop faster th...