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This study discusses the crystal structure and magnetic properties of the rare-earth doped La 0.8 R 0.2 (Fe 0.88 Si 0.12) 13 (with R = Sm, Tb) compounds. All the samples were prepared by using arc-melting technique in argon atmosphere and the obtained result shows that after heat treatment, the samples exhibited the NaZn 13-type cubic phase with a small amount of a secondary ¡-Fe phase. The magnetic properties and magnetic entropy change were determined by mean of the temperature and field dependence magnetizations. Besides the decrease in the lattice constants, there was also observed a significant increase of Curie temperature and magnetic entropy change ¹¦S M which reached a maximum of 4.5 J/kg K for La 0.8 Sm 0.2 (Fe 0.88 Si 0.12) 13 , corresponding to a relative cooling powers (RCP) of 102 J/kg for the sample.