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Green light-emitting Ca3Mg3Si4O14:Eu2+ phosphors were prepared by solid-state reaction using CaCO3, MgO, SiO2 and Eu2O3 as raw materials. The effects of Eu-doping concentration and fluxes (NH4Cl, BaF2) on the crystal structure, luminescence property, surface morphology and thermal stability of phosphor were studied, which were characterized by X-ray diffraction (XRD), photoluminescence (PL) spectra and scanning electron microscope (SEM), respectively. The XRD results show that the crystal structure of Ca3Mg3Si4O14:Eu2+ is consistent with the calculated patterns, which investigated the crystal structure of the compound Ca3Mg3Si4O14:Eu2+. The phosphor has strong excitation around 360-450 nm and exhibits a broad emission band with a maximum at 530 nm under 440 nm excitation. With the increase of Eu2+ concentration, the phosophor shows a red-shift and the quenching concentration of Eu2+ is about 6%. Furthermore, it also possesses high thermal stability, with the emission intensity reduced by only 7.6% at 150℃. With the introduction of fluxes, the crystallinity, luminous intensity and particle morphology of phosphor have been improved. These luminescnce properties indicate that Ca3Mg3Si4O14:Eu2+ phosphor is a promising green phospho for use in solid-state white lighting.