Abstract: Using metal nitrate and urea as raw materials,BaAl₂O₄:Eu²⁺,Dy³⁺ phosphor with bright turquoise and long afterglow was prepared by combustion synthesis.The properties of phosphor were characterized by means of X-ray diffraction （XRD）,scanning electron microscopy （SEM） and fluorospectrophotometer. The results show that,with the increasing of combustion temperature,the violent degree of reaction increases,the content of BaCO₃ decreases,the crystallinity of BaAl₂O₄ increases,and the grain size increases. The peak value of excitation and emission spectrum of BaAl₂O₄:Eu²⁺,Dy³⁺ is respectively 310 nm and 500 nm,and the spectrums show characteristic of broad band. The luminescence of phosphor is due to the transitions from 4f⁶5d¹ to 4f⁷ configuration of the Eu²⁺ ion,and its long afterglow is due to the effect of electron trap of Dy³⁺.