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This paper investigates a method for measuring SO 2 concentration using Fabry-Perot interferometer correlation spectroscopy. In this method, the experimental system is designed as a separated beam, with the beam entering the F-P cavity at two incidence angles simultaneously to match the peak and valley positions of the SO 2 absorption cross-section. The system achieves a 2σ detection limit of 28.2 ppm·m(15 cm) at a sampling frequency of 10 Hz. An outfield comparison experiment with the differential optical absorption spectroscopy method shows good agreement for the simultaneous measurement of SO 2 concentration from sulfur combustion, with a correlation coefficient of R 2  = 0.93. This study introduces a non-dispersive, highly accurate, and fast gas detection technique.