We investigated the effects of the powder characteristics of various domestic iron oxides (${alpha}Fe_2O_3$) on the magnetic properties of Sr-ferrites The particle size and the distribution of iron oxides were classified hy three different rerinning methods, and greatly a affected on the magn$xi$tic prope$pi$ies and the mmphology of Sr-ferntes. The agglomeration of Ruthner iron oxides and the large particles of Chemirite (CY) above $0.80{mu} extrm{m}$ were degraded the prope며es of Sr-fcrrites. The optimal magnetic prope$pi$ies of Srt territes, showing 68.2 emu/g of saturation magnetization and 4300 Oe of intrinsic coerClvity, were achieved at the following c conditions; Chemirite (P2EP) iron oxides of $0.14{mu} extrm{m}$ molar ratio of 5.8. and calcination of $1150^{circ}C$/1 hr.