In this paper, Sr3ZnNb2O9∶0.3Eu3+, xNa+ (x=0,0.1,0.2,0.3,0.4,0.5) phosphors were successfully prepared by high temperature solid-state reaction. XRD patterns and refinement results show that Eu3+ and Na+ are successfully doped into the matrix and partially substituted Zn2+. The microscopic morphology and element distribution of the samples were confirmed by scanning electron microscopy. The spectral characteristics and thermal stability analysis show that the optimal doping concentration of Na+ is x=0.2. The introduction of Na+ improves the thermal stability of Sr3ZnNb2O9∶0.3Eu3+ phosphors and the calculated activation energy is 0.163 eV. The CIE color coordinate of the Sr3ZnNb2O9∶0.3Eu3+, 0.2Na+ samples is calculated to be (0.618, 0.376), the correlated color temperature and the color purity are 1 855 K and 98.46%, respectively.