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, and thermal stability of phosphor were studied, which were characterizes by X-ray diffraction (XRD), and photoluminescence (PL) spectra, 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 phosphor shows a red-shift and the quenching concentration of Eu2+ is about 6%. With the introduction of NH4Cl and BaF2 as fluxes, the luminous intensity of Ca3Mg3Si4O14∶Eu2+ phosphor has been improved. Compared with the luminescence intensity of Ca3Mg3Si4O14∶Eu2+phosphor without flux, the photoluminescence intensity increased by 70% when adding NH4Cl as flux. Furthermore, the emission intensity reduced by only 7.6% and 14% at 150 ℃ for Ca3Mg3Si4O14∶Eu2+ phosphor and commercial green phosphor. The Ca3Mg3Si4O14∶Eu2+ phosphor also possesses high thermal stability, and these luminescnce properties indicate that Ca3Mg3Si4O14∶Eu2+ phosphor is a promising green phosphor for use in solid-state white lighting.