To study the performance of asphalt mixture with polyester fiber, polyester fiber is contrasted with lignin fiber. The test is taken for comparing the performances of the two fibers. By the tests of dynamic shear rheometer (DSR) and bending beam rheometer (BBR),the performance of polyester fiber asphalt mortar is studied. By the rutting test, low-temperature bending beam test, water stability test, and four point bending beam fatigue test, the pavement performance and the improvement mechanism of the asphalt mixture without fiber, the asphalt mixture with polyester fiber and the asphalt mixture with lignin fiber are comprehensively analyzed. The results show that the polyester fiber can evidently enhance the performance of the asphalt mixture, and that the mixture with polyester fiber obtains a better performance than the mixture with lignin fiber.

polyester fiber  /  asphalt mixture  /  pavement performance  /  four point bending beam fatigue test