The intense white emitting phosphors Ca2SiO3Cl2:Eu2+, Mn2+ were synthesized by traditional high temperature solid state reaction，and their luminesce properties were studied. The results indicate that the emission band consists of three peaks located at 425 nm，498 nm and 578 nm, respectively. The emission peaks at 425 and 498 nm originate from the transition 5d→4f of Eu2+ ions that occupy the two Ca2+ sites in the crystal of Ca2SiO3Cl2, while the 578 nm emission is attributed to the energy transfer from Eu2+ ions to Mn2+ ions. The white light can be obtained by mixing the three emission colors of blue (425 nm), green(498 nm) and red(578 nm) in the single host. The excitation spectra of the three emission colors all extend from 250 nm to 420 nm, and their peaks positioned around 370 nm, 385 nm, 396 nm and 412 nm, respectively. The phosphor can be excited effectively by InGaN chip in the range of 350—410 nm. The experiment results show that the Ca2SiO3Cl2: xEu2+, yMn2+ is a single host phosphor with superior properties for use in white light emitting diode (w-LED).