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The La–Zn substituted Sr-Magnetoplumbite ferrite La_xSr_1−xZn_xFe_12−xO₁₉ (x=0–0.6) fine particles were prepared to investigate the effects of the substitution on the magnetic properties of the samples. It is observed, with increasing substitution rate, that the saturation magnetization M_s as well as the magnetocrystalline anisotropy constant K_U1 increased up to a maximum for about x=0.3, then decreased rapidly. The value of dH_c/dT also reduced rapidly from about 5.5 Oe K⁻¹ (for x=0) to −0.5 Oe K⁻¹ (for x=0.4). A qualitative explanation was given with respect to the hypothesis of crystalline electronic field and the single ion model.