：The end-force measurement of minimally invasive surgical puncture probes is crucial for achiev• ing precise control of such probes，improving the quality of surgeries，and ensuring the safety of surgical operations. In this study，a fiber optic force sensor with a Fabry-Pérot(F-P)-cavity-cascaded fiber Bragg grating(FBG)that can be integrated into the probe is designed to meet the actual requirements for measur• ing the force at the end of a puncture surgical probe. First，based on the double-beam interference theory of the F-P cavity and fiber grating sensing theory combined with the cantilever beam structure of the probe，the F-P cavity and FBG of the fiber optic sensor implanted in the probe sensing model are ana• lyzed. Then，the mapping relationship between the characteristic wavelength shift of the F-P cavity and the FBG and the applied force are deduced，with the force and temperature sensitivity matrix being intro• duced to realize the probe force measurement while effectively avoiding the cross-influence problem of tem •

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