A method for suppressing backscatter noise based on transient process optimization is proposed. This method optimizes the parameters of triangular wave modulation and demodulation to address the serious effect of backscatter noise on a resonant fiber optic gyro (RFOG). The method optimizes the phenomenon of the transient process present in triangular wave modulation by partial sampling and mean filtering to improve the rejection ratio of backscatter noise and the linearity of the workspace of the demodulation curve without changing the optical and electrical hardware of the gyro. The results of experiments conducted with a prototype showed that the noise suppression method based on transient process optimization could reduce the duty cycle of the transient process from 64.3% to 12.1%, and the suppression ratio of backscatter noise reached 46.8%. At the same time, the workspace of the demodulation curve had a linearity of 99.6%. The method based on transient process optimization efficiently improved the suppression of backscatter noise in an RFOG, along with the linearity of the workspace of the demodulation curve.