Technical magnetic properties of Ba and Sr oxide magnets were measured with various amounts of additionals. It has been found that SiO_2, B_2O_3, GeO_2 and Cr_2O_3 are fairly effective, but CdO, SnO, CoO and CuO are not effective and V_2O_5 is very injurious. The improved properties of the isotropic ferrite magnet with these additionals are, for instance, 2500 Gauss in remanence and 1700 Oersted in coercive force and 1.5×10^6 Gauss Oersted in BH_. Curie points of Ba and Sr ferrite are 450℃ and 475℃ respectively and they are not changed by 3 per cent or so of these additionals. Effect of magnetic annealing could not be observed in the system. dI/dT is 0.6～0.4 Gauss/degree and no additional has been found to decrease dI/dT without the decrease of I_3 in the scope of the work
