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The Raman and X-ray photoemission spectroscopy of lanthanum-doped SrBi4Ti4O15 (SBLT -x, x =0.00, 0. 05, 0. 10, 0. 25, 0.50, 0. 75 and 1.00) ferroelectric ceramics were investigated to explore the La substitution site and the influence of La-doping on the oxygen vacancy concentration. The results suggest that La3+ions behave pronounced site selectivity for the A site in the case of x ≤ 0.10, and they are incorporated into Bi2O2 layers at higher content. The oxygen vacancy concentration declines with La-doping, and the decrease seems saturated as La content is higher than 0.10.