Abstract: Tb-doped（Y,Gd）BO₄:Tb³⁺ green-phosphor with small size,high crystallinity and good photoluminescence intensity was prepared by co-precipitation method.Ultrafine precursor powders were obtained by controlling the solution concentration.The effects of the concentration,flux and calcinations temperature on the phosphor were discussed.The green-phosphor was characterized by（X-ray） diffraction,SEM,particle size determination and photoluminescence.In addition,the characteristics of the green-phosphor were compared with those of a commercial product.The phosphor particles prepared at 1100℃ have the best（characteristics,） such as completely spherical shape,fine particle size,no-aggregation,and the product prepared by solid state reaction.The phosphor has stronger ability to resist vacuum ultraviolet eradiate,and（luminescence） intensity of the phosphor is higher than the commercial product.