Abstract: SrAl2O4 is one of the most important martrix materials for the long persistence phosphors. The precursors with composition of SrCO3•2Al(OH)3•7H2O were prepared by the co-precipitation method from NH4HCO3，NH4Al(SO4)2•12H2O and Sr(NO3)2，and SrAl2O4 powders were obtained from sintering the precursors at a lower temperature than the traditional solid state method. The precursors and the products were characterised with FTIR，SEM，EDS，XRD and TG-DSC. The results indicated that the compositions and surface shapes of samples were greatly affected by molar ratios of Sr and Al and pH. The spherical precursors were prepared with terms of n(Sr)∶n(Al)= 1∶1.6 and pH=7.6，and the mono-dispersed and spherical SrAl2O4 powders were synthesized from sintering the precursors at 1100℃ for 2 h in the air，which was about 400℃ lower than the traditional high temperature solid state method.