With Nd3+ doping and Ca2+, Sr2+ modulating in the sol-gel technique, a series of polycrystalline perovskite samples La0.7-xNdx(Ca, Sr)(0.3)MnO3 (x = 0, 0.05, 0.1, 0.15, 0.20, 0.25) was prepared, their maximum magnetic entropy changes were tuned to room temperature (Delta S-H = -1.47 J/kg K at 298 K for La0.45Nd0.25(Ca, Sr)(0.3)MnO3), an enhancement of the maximum magnetic entropy change (Delta S-H = -1.89 J/kg K at 315 K) and its refrigerant capacity (about 45.3 J/kg) had also been obtained under 9 kOe magnetic field variation for La0.55Nd0.15(Ca, Sr)(0.3)MnO3 contrast to La-0.7(Ca, Sr)(0.3)MnO3. (c) 2012 Elsevier B. V. All rights reserved.