The effect of different concentrations of Mg (II) ion on luminescent intensity of Tb (III) complex material in ethanol, methanol and DMSO solutions has been studied. The results show that the quenching effect of organic solvents for the luminescence of Tb (III) complex material was in the order DMSO>methanol>ethanol. The Mg (II) ion of different concentrations has obvious quenching effect to luminescent emission of Tb (III) complex material in organic solvent. And the quenching effect of 0.2 mol/L Mg (II) ion is weakest. And the quenching effect of 0.8 mol/L Mg (II) ions is strongest.