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A red-emitting CaZrOa :Eu3+ phosphor has been prepared by solid state reaction and its luminescent properties are studied.The crystal structure is investigated by the x-ray diffraction.Through energy transitions of5 Do →7Fj (J = 0,1,2,3) in Eu3+ ions, the emission spectrum of the phosphor shows a series of narrow bands under near-ultraviolet light and the strongest peak locates at 613nm.The emission intensity of Cai-xZrO3:xEu3+ phosphor will reach the maximum as the molar concentration of Eu3+ is 5mol%.