Abstract: POR, PPA, vulcanization cross-linking system (sulfur, stabilizer and vulcanization accelerator) and the origin of asphalt stocks all influence the storage stability of modified asphalt. The test results show that the use of TOR and PPA can reduce the softening point difference of segregation of the modified asphalt to a certain extent. There is an optimal value for the dosage of sulfur and stabilizer in the vulcanization system. The compatibility of accelerator has a significant influence on the storage stability of the modified asphalt, and the asphalt stocks from different sources is a decisive factor impacting on the storage stability of the asphalt. The higher aromaticity of matrix asphalt is helpful to the swelling of the crumb rubber in the asphalt and to the desulfurization degradation and cross-liking process, resulting in satisfied modification effect.