Critical temperature, critical current density, and upper critical flux density of a Nb₃Sn multifilamentary wire with a CuNb reinforcing stabilizer have been measured to investigate the temperature scaling on the pinning force in the ranges of 4.2≤T≤10.0K and 4.0≤B≤15.0T, where F_p=AB_c2^m(T)b^p(1-b)^q and b=B/B_c2. From the J_c and B_c2 measurements with theoretical analyses, the characteristic values of T_c-16.9K and B_c2(0)-28.0T have been obtained. As a result, the temperature scaling law was given with the pinning parameters of m=2.30, p=0.92, and q=2.15. A factor decreases with the increase in the strain because not only superconducting bulk property changes but also the microstructure is affected.