Commercial coating design software based on optical transfer matrix theory and traditional method of correlation analysis are used to obtain a series of simulated reflection spectrum of ultraviolet AlGaN-based Bragg reflector (center wavelength of 314 nm). The correlation between partial structural parameters and reflectivity or center wavelength are studied, as well as the correlation coefficients. The results of correlation analysis show that the thickness of the AlGaN layer is the most impact factor on the reflectivity and the center wavelength, which is a negative correlation. Bases on this conclusion, we obtain an optimal UV AlGaN DBR structure with high reflectivity and wide detection band. Furthermore, the correlation analysis and optimization results match the actual data, which provide a new way and method for the design and application of UV AlGaN DBR.