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The hydrogen absorption of the LaFe10.9-Co0.8Si1.3 compound under constant 1.01 × 105 Pa H2 gas in a flow hydrogen atmosphere was studied.The effects of hydrogen absorption on structure,Curie temperature,phase transition and magnetic property were investigated by X-ray diffraction (XRD),differential scanning calorimeter (DSC) and superconducting quantum interference device,respectively.The hydrides of LaFe10.9Co0.8Si1.3 crystallize into NaZn13-type structural phase after hydrogen absorption at temperature from 548 to 623 K.Lower hydrogen absorption temperature is of no advantage for pure 1∶13phase formation in a flow H2 atmosphere.The Curie temperature (Tc) of LaFe10.9Co0.8Si1.3 compound increases by 70 K or more after hydrogen absorption.For LaFe10.9-Co0.8Si1.3H1.8 compound,the maximum magnetic entropy change and the relative cooling power under a magnetic field change of 0-2 T are 6.1 J·kg-1·K-1 and 170 J·kg-1,respectively.Large refrigerant capacity,low hysteresis loss and wide temperature span of magnetic entropy change peak make it a competitive practical candidate for magnetic refrigerant.