In this paper, we investigate the strong summability of multiple Fourier series by the Bochner-Riesz spherical means at criticnl index. We prove that the localization theorem of the strosng summability holds for any posityve degree, that is, if f(x) EL(Qn) and f(x)=0(1x-x01), then lim R-∞ 1/R R0|S #-1/2(f; x0)|qdu=0 (for any q>0). We also give certain results on the strong summability which improves Boehner-Ohand sekharan's theorem.