NaY(MoO4)2:Sm3+ phosphor was synthesized by solid state reaction and its luminescent properties were studied.X-ray diffraction(XRD) results show that 550 ℃ is a suitable sintered temperature for preparation of NaY(MoO4)2:Sm3+ phosphors.Its excitation spectrum has several sharp peaks.The peak centered at 297 nm can be attributed to the O-Sm charge transfer transition.The strongest peak appears at 403 nm(6H5/2→4F7/2).The sample can be excited by UV-LED and blue light.The emission spectrum of the phosphor is composed of four major emission peaks centered at 564 nm(4G5/2→6H5/2),600 nm and 607 nm(4G5/2→6H7/2),647 nm(4G5/2→6H9/2),708 nm(4G5/2→6H11/2).The strongest peak appears at 647 nm(4G5/2→6H9/2).The effects of the Sm3+ concentration on the emission intensity are also investigated and the concentration quenching happers when the concentration of Sm3+ is 0.05.According to the Dexter theory,the concentration quenching mechanism is from the d-d interaction.