The local multi-sequence dynamic creep test method is used to test the field core samples of expressway pavement for 5 consecutive years and analyze the development trend of the high-temperature performances. The results show that the variation coefficients of high-temperature performance of pavement core samples at different layers all exceed 20%. The high-temperature performances of the overall structure and the upper layer decay obviously with the increase of service time. The decaying rate is lower than 20% within 15 years of design period, and the decaying rate will increase over 50% after the design period. By comparing the high-temperature performances of the different layers and the overall structure, the upper layer is weaker, the middle layer is the closest and the lower layer is more optimal.