In order to study the evaluation method of storage stability of styrene-butadiene-styrene block copolymer (SBS) modified asphalt based on the dynamic shear rheological (DSR) test, SBSΙ-D modified asphalt was selected as the raw material. The segregation softening points differences of different storage time at 163 ℃ were tested. Based on the corresponding complex shear modulus, phase angle, and rutting factor, a calculation model of SBS modified asphalt storage stability evaluation index is proposed, which takes the complex shear modulus segregation parameter, phase angle segregation parameter, rutting factor segregation parameter and the linear slope formed by the three parameters and temperature as parameters. The results show that the segregation softening points differences of SBSΙ-D modified asphalt gradually increase with the extension of high-temperature storage time, and the relationship between them is basically linear. After segregation, the elastic composition, deformation resistance and high-temperature performance of the upper 1 / 3 of SBSΙ-D modified asphalt are significantly greater than that of the lower 1 / 3. The calculation model of SBS modified asphalt storage stability evaluation index based on the DSR test, which takes complex shear modulus segregation parameter, phase angle segregation parameter, rutting factor segregation parameter, and the linear slope formed by the three parameters and temperature as parameters, has high consistency with the evaluation result based on segregation softening point difference.