We have reported here a new route to synthesize nanosized (La 0.47 Gd 0.2 )Sr 0.33 MnO 3 perovskite-type oxides at relatively low calcinated temperature of 600 and 800°C using amorphous molecular alloy as precursor. X-ray diffraction (XRD) and electron diffraction (ED) revealed that the resulting products are of pure single-phase rhombohedral structure. Transmission electron microscopy (TEM) observation found that the particle-sizes are about 40–50 and 80–100nm, respectively. The Curie temperature T c and magnetocaloric effect (MCE) of (La 0.47 Gd 0.2 )Sr 0.33 MnO 3 nanoparticles have been studied. A relatively large magnetocaloric effect (MCE) with a broad peak around Curie temperature (285.9K) is observed in (La 0.47 Gd 0.2 )Sr 0.33 MnO 3 polycrystalline nanoparticles calcinated at 800°C for 10h. These results suggest that the material may be a suitable candidate as working substance in magnetic refrigeration near room temperature.