The BaMgSiO4:Eu2+/Eu3+ phosphors are prepared in air atmosphere by a conventional solid-state reaction, the properties of BaMgSiO4:Eu2+/Eu3+ phosphors are investigated through X-ray diffraction (XRD), infrared spectroscopy (FTIR), scanning electron microscope (SEM) and photoluminescence (PL). The results suggest that the emission spectra of Eu2+ and Eu3+ ions are both presented in the Eu-doped BaMgSiO4 phosphors under the excitation of 393 nm, and the emission intensity of Eu2+/Eu3+ can be changed with the NH4Cl contents to achieve tunable spectra from green light to white light. The PL intensity of Eu3+ is improved with increasing of NH4Cl contents, and the value of I Eu2+/Eu3+ is the smallest when adding 5% NH4Cl in the BaMgSiO4:Eu2+/Eu3+. The warm white light with international commission on illumination (CIE) chromaticity coordinates (0.37, 0.38) and color temperature CCT (4300 K) is obtained. BaMgSiO4:Eu2+/Eu3+ phosphor shows better thermal stability because the emission intensity measured at 200 ℃ is only decreased 15% compared with that measured at room temperature. The results show that BaMgSiO4:Eu2+/Eu3+ can be used as potential single-doped and single-composition white light emitting diode (LED) phosphors.