The mixing torques of recycled SBS modified asphalt mixture under different mixing temperatures were determined. The optimal mixing torque of matrix asphalt mixture corresponding to the isoviscous temperature of 017 Pa·s on viscosity temperature curve of matrix asphalt was determined, and the mixing temperature corresponding to the optimal mixing torque on the mixing torque mixing temperature fitting curve of recycled SBS modified asphalt mixture could be seen as the optimal mixing temperature of recycled SBS modified asphalt mixture. According to the viscosity shear rate curve of recycled SBS modified asphalt at the optimal mixing temperature, the shear rate of recycled SBS modified asphalt at the optimal mixing temperature was determined, and the viscosity temperature curve of recycled SBS modified asphalt under this shear rate was obtained through experiment. The isoviscous temperature of (028±003）Pa·s on the viscosity temperature curve of recycled SBS modified asphalt could be seen as the optimal compaction temperature of recycled SBS modified asphalt mixture. The surface dry method validation results show that with the above method to determine the optimal mixing temperature of recycled SBS modified asphalt mixture is reasonable.