[Purposes]The paper aims to study the practicability of the blending theory of recycled asphalt, provide a theoretical basis for the road performance of recycled asphalt, and promote the application and development of recycled asphalt in road engineering practice. [Methods]By adding the same grade of matrix asphalt, the recycling experiments were carried out on new and old asphalt with different contents,at the same time, the three inde- xes of asphalt, Brookfield viscosity and American strategic highway research program (SHRP)indexes were used for research. [Findings]For recycled 70^#matrix asphalt and recycled SBS modified asphalt with different matrix asphalt contents, the linear accuracy between penetration logarithm, high-temperature rutting factor logarithm, viscosity logarithm and new asphalt content is more than 0.99. [Conclusions]The logarithm of penetration, high-temperature rutting factor, viscosity and ducitility of recycled asphalt with different matrix asphalt contents all meet the equation of theblending theory; but the linear ccuracy between low-temperature creep rate, stiffness modulus and new asphalt content of recycled asphalt at each temperature is poor.