A new Tb (III) complex luminescent material has been synthesized. And it was characterized by infrared spectrum. The luminescent properties of the above luminescent material were investigated in solid and in ethanol, methanol and DMSO solutions. The solvent factors and the doping different concentration of Mg (II) ion influencing the fluorescent intensity are discussed. The results show that both the solvents and the doping different concentration of Mg (II) ion could weaken the luminescent intensity of Tb (III) complex luminescent material.