Aiming at the limitations of 5℃ ductility on evaluating the low-temperature properties, in order to find an index to evaluate the low-temperature properties of rubber asphalt more accurately, based on the bending beam rheometer test, the research on the low-temperature evaluation indexes of TFOT-aged and PAV-aged rubber asphalt which processed in the laboratory were carried out. The analysis was made on the low-temperature evaluation indexes of rubber asphalt based on the bending beam rheometer such as stiffness modulus, the rate of stiffness modulus, performance grade temperature, continuous grade temperature, k value and the S_A index which take asphalt modulus and relaxation capacity into consideration. Test results showed that, with the rubber powder adding into asphalt, its low temperature crack resistance improved significantly, one-sidedness was existed to evaluate the low-temperature properties of rubber asphalt by a single S index or a single m index; indexes which take asphalt modulus and relaxation capacity into consideration including C_T index and k index and S_A index were better applied to evaluate the low-temperature properties of rubber asphalt. By doing correlation analysis between these low-temperature evaluation indexes of rubber asphalt with the bending strain energy density of rubber asphalt mixture and by doing comprehensive comparison, conclusions were made as follows, on the substantial projects we gave priority to recommend k value and C_T index as the low-temperature evaluation indexes, while undertaking research work, we gave priority to recommend S_A index as the low-temperature evaluation index of rubber asphalt.