Strontium aluminate long persistence phosphors are synthesized by combustion method. By controlling the raw material ratio(Sr/Al), the effects of phase composition on subsequent spectroscopic properties of phosphors are studied. Results show that the phase composition changes from strontium-rich phase to aluminumrich phase with the decrease of Sr/Al: when the rate of Al/Sr changes from 3:1 to 1:1, the main crystal phase of samples is Sr3Al2O6, and it exhibits the characteristic fluorescence of Eu 3+ in the lattice of Sr3Al2O6; when the rate of Al/Sr is between 1:2 and 2:7, phase composition is the mixture of SrAl2O4 and SrAl4O7, and it emits the characteristic fluorescence of Eu2+ in SrAl2O4 but not in SrAl4O7; when Al/Sr decreases to 1:4 or even 1:12, the main crystal phase of samples transform into SrAl12O19, and the characteristic emission peak is about 470 nm, which corresponds to the characteristic emission of Eu2+ in SrAl12O19. At the end of the article, the influence laws of two different synthesis methods on phase composition of samples between high-temperature solid method and combustion method are compared. Compared with the high-temperature solid method, the rule of influence is similar, but the mole ratio of Al/Sr in products is always higher than the initial ratio of the raw material, and compounds like Sr4Al14O25 are not obtained by combustion method. Strontium aluminate long persistence phosphors are synthesized by combustion method. By controlling the raw material ratio (Sr / Al), the effects of phase composition on subsequent spectroscopic properties of phosphors are studied. Results show that the phase composition changes from strontium-rich phase to aluminumrich phase with the decrease of Sr / Al: when the rate of Al / Sr changes from 3: 1 to 1: 1, the main crystal phase of samples is Sr3Al2O6, and it exhibits the characteristic fluorescence of Eu 3+ in the lattice of Sr3Al2O6; when the rate of Al / Sr is between 1: 2 and 2: 7, the phase composition is the mixture of SrAl2O4 and SrAl4O7, and it emits the characteristic fluorescence of Eu2 + in SrAl2O4 but not in SrAl4O7; when Al / Sr decreases to 1: 4 or even 1:12, the main crystal phase of samples transformed into SrAl12O19, and the characteristic emission peak is about 470 nm, which corresponds to the characteristic emission of Eu2 + in SrAl12O19. At the end of the article, the influence laws of two Compared with the high-temperature solid method and the combustion method are compared. the compared with the high-temperature solid method and the combustion method are compared. the initial ratio of the raw material, and compounds like Sr4Al14O25 are not obtained by combustion method.