To evaluate the low-temperature performance of middle layer asphalt mixtures,dynamic modulus tests of M2F trapezoidal beams,low-temperature bending tests of small beams,and line shrinkage coefficient tests of middle beams were conducted on seven AC-20 asphalt mixtures. The evaluation results and correlations of five test indexes,including complex modulus,phase angle,maximum bending strain,strain energy density,and line shrinkage coefficient,were analyzed to select the optimal evaluation indexes for low-temperature performance. The results show that there are significant differences in the evaluation results of low-temperature performance of each asphalt mixture using different test methods and evaluation indicators. Among them,the phase angle at -10 ℃ is the optimal evaluation index for the M2F trapezoidal beam dynamic modulus test,the maximum bending strain is the most suitable index for the low-temperature bending test of small beams,and the line shrinkage coefficient is a suitable index for evaluating the low-temperature performance of asphalt mixtures. SBS modified asphalt mixtures have the best low-temperature performance,followed by rubber asphalt and anti-rutting agent modified mixtures,and high-grade asphalt mixtures have better performance than low-grade ones. Increasing the coarse aggregate content appropriately can improve the low-temperature performance of asphalt mixtures,but the low-temperature performance of recycled asphalt mixtures is relatively poor.