Magnetic entropy change ofLa0.75Ca0.25MnO3with different particle size has been investigated. Magnetic entropy change∼4.7 J/kg Klarger than that ofGdhas been observed at224 Kunder a magnetic field of1.5 Tin comparatively big particles. This phenomenon of large magnetic entropy change indicates that the perovskite-type manganese oxides have potential applications for magnetic refrigerants in high temperature.©1997 American Institute of Physics.