The cone penetration,shear strength,softening point and ductility tests of fiber asphalt mortar,as well as the rutting test,low-temperature bending test and freeze-thaw splitting test of corresponding asphalt mixture,are carried out on the flocculent,granular and improperly preserved flocculent lignin fiber commonly used in highway engineering·The results of water stability analysis show that different types of fibers have different effects on the properties of the cement paste and mixture,and the normal flocculent lignin fibers have better effects on the road performance of the cement paste and mixture.Damping has a great impact on the improvement of pavement performance of SMA-13 asphalt mixture by fiber.The high-temperature rutting resistance of SMA-13 asphalt mixture is about 35％～40％,the water stability is about 10％,and the low-temperature cracking resistance is about 14％～27％.During the use of lignin fiber,it should be prevented from moisture,agglomeration and deterioration to ensure its good performance.
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