The K₃AlK₆:Eu³⁺ fluorescent powder was synthesized by two-step synthesis method,and X-ray diffraction (XRD),scan electron microscopy (SEM) and fluorescence spectra (PL) were used to analyze the experimental samples. The effect of Eu³⁺ doping on the luminous intensity of K₃AlF₆:Eu³⁺ wa s studied in this experiment.XRD and SEM results show that the K₃AlF₆:0.24Eu³⁺ was with apure phase and crystallized well,and the cr ystal size was even,but the cell parameters were changed after doping indicating that Eu³⁺ had entered the lattice.According to ionic electronegativity,th e radii of Eu³⁺ (1.433) and Al³⁺(1.513) are similar,leading to Al3+ replaced by Eu³⁺.Al³⁺ is in the symmetric center of K₃AlF_6crystal,after Al³⁺ replaced with Eu³⁺,then ⁵D₀－⁷F ₁ magnetic coupling luminescence is enhanced.When the Eu³⁺ doping concentration is 0.24%, using 393nm to excite samples to emit the strongest orange fluorescence at 593nm,it belongs to ⁵D₀－⁷F₁ magnetic dipole tr ansition.So K₃AlF₆:Eu³⁺ phosphor has a certain significance in the field of white luminescence.