The Ba-ferrite particles have a positive temperature coefficient of dH c /dT. From the viewpoint of recording system applications, the dH c /dT should be reduced in order to improve the operating margin for temperature change. It was shown that the coercivity, H c , of Ba-ferrite particles is mainly controlled by the crystalline anisotropy. In the Ba-ferrite there are five distinct crystallographic sites or sublattices, and the Fe 3 + ion located on different site has different contribution to crystalline anisotropy. The replacement of Fe 3 + ions by Zn 2 + , Ni 2 + , and Ti 4 + ion will effect on the saturation magnetization σ s , coercivity H c and their temperature coefficients. The Zn-Ti, Ni-Ti, and Ni-Zn-Ti substituted Ba-ferrite particles were investigated. It was found that the Zn-Ti substituted Ba-ferrite particles have higher σ s , but large temperature coefficient of coercivity dH c /dT. In the case of Ni-Ti and Ni-Zn-Ti substitution the dH c /dT could be reduced to a small value, near to zero or negative value, while the σ s decreases very slowly with increasing the amount of substitution.