Since the complex mechanical properties of asphalt concrete occurs, to acquire accurate Duncan Chang model parameters K, n and Rf under the low temperature environments, the two-point method, the all-datapoint method and the segmentation method were used for data process, and fitting analyses was conducted for the inversely calculated and tested stress-strain curves based on the pre-calculated results in the paper. The results showed that, the optimal fitting curve was obtained by the segmentation method at confidence level larger than 0.9; judged from the calculated results, the method that to select the 60%~95% stress level test points to involv in the calculation was the most suitable for the model parameter calculations of asphalt concrete static triaxial test under low temperature environments.