A series of orange-red phosphors Ca3Y2－2x(Si3O9)2∶2xSm3+ were synthesized by conventional solid-state reaction, and their photoluminescence properties were investigated. The X-ray diffraction (XRD) pattern shows that Ca3Y2(Si3O9)2∶Sm3+ crystals are the pure phase. The excitation spectra contain the characteristic excitation of Sm3+. The emission spectra of Ca3Y2(Si3O9)2∶Sm3+ phosphors exhibit three main peaks assigned to the 4G5/2→6HJ/2(J=5,7,9) transitions of Sm3+ under 402 nm excited radiation, the dominating emission peaks at 565 nm, 604 nm, 651 nm. The decay time of 4G5/2 level in Sm3+ was measured by the time resolved spectrum. The luminescence intensity firstly increases with increasing of Sm3+ concentration, and then decreases, the emission reaches the maximum intensity at x=0.02, and the concentration quenching mechanism is the electric dipole-electric dipole interaction.