Expanding the measurement range of the optical fiber can substantially improve the applicability of pressure sensing system based on polarization properties . Accordingly, a sensing method based on the fusion of multiple Stokes parameters is proposed to expand the measurement range while ensuring high sensitivity. The polarization rotation axis of the sensor is obtained using theoretical simulations. Then, polarization controllers, a pressure device, and a polarimeter are used to achieve a sensing performance with a linearity of 99.8%, sensitivity of 0.1938 N^-1, and measurement range of 28 N. The measurement range of the proposed multiparameter fusion method is five times larger than that of the methods based on single-parameter measurement, confirming the theoretical design. The proposed method can highly improve the performance and applicability of sensing systems based on polarization properties .