Choose matrix asphalt concrete, basalt fiber asphalt concrete, SBS modified asphalt concrete, basalt fiber+SBS modified asphalt concrete as research samples. Using digital image correlation(DIC) technology to measure the global displacement and strain of four types of asphalt concrete beam specimens under repeated loads from microscope view, and the crack development was analyzed in time and space. With the strain concentration rate in the stable development stage of the crack under the action of the freeze thaw cycle of the snow melting agent(salt solution) for index, the orthogonal test range analysis and the variance analysis are used as the methods to study the strain concentration rate effects of basalt fiber, freeze thaw times, salt solutions (NaCl, CH3COOK, CaCl2) on asphalt concrete beams specimen. The results show that the life of basalt fiber asphalt concrete is closely related to the degree of strain concentration; the reinforce methods of SBS and basalt fiber are complementary; under the same salt freeze thaw cycle conditions, the addition of basalt fiber can reduce the strain concentration rate of asphalt concrete; the effect of salt solutions on the strain concentration rate of asphalt concrete is in order of CaCl2, NaCl, CH3COOK; the main action mode of salt freeze thaw is still the penetration of ice crystals.