To investigate the crack resistance of cement stabilized macadam,the experiments of dry shrinkage,thermal shrinkage,flexural strength and flexural elastic modulus of polypropylene fiber reinforced cement stabilized macadam and common cement stabilized macadam were conducted.Adopting dry shrinkage energy anti-cracking coefficient and thermal shrinkage energy anti-cracking coefficient as evaluation index of crack resistance,the effects of curing period,fiber content and cement content on the crack resistance were investigated.The results indicate that the addition of polypropylene fiber can enhance dry shrinkage crack resistance and thermal shrinkage crack resistance.With increase of curing period,dry shrinkage crack resistance increases gradually,while thermal shrinkage crack resistance decreases slightly.When the fiber content does not exceed 0.1%(by volume),dry and thermal shrinkage crack resistances are enhanced with increase of polypropylene fiber content.With increase of cement content,dry and thermal shrinkage crack resistances both tend to reduce.