A dual-parameter fiber-optic sensor based on Fabry-Perot interferometer (FPI) structure is described and demonstrated to measure gas pressure and temperature simultaneously.The proposed sensing structure consists of an extrinsic FPI in the form of hemispherical ultraviolet curing glue capped on a single mode fiber end face.The spectral interference peak produced by FPI is sensitive to ambient temperature and gas pressure variations.We select two resonant peak dips in the interference spectrum to track their wavelength changes with gas pressure or temperature,constructing transport matrices capable of measuring both gas pressure and temperature and eliminating mutual cross-sensitivities.The experimental results showed that the gas pressure and temperature sensitivity at dip 1 were of 2.925 nm/MPa and －1.165 nm/℃,and the gas pressure and temperature sensitivity at dip 2 were of 4.715 nm/MPa and －1.209 nm/℃,respectively.Building the measurement matrix using the gas pressure and temperature sensitivity of dip 1 and dip 2,the sensor can realize the multi-parameters measurement.The stability experiment of the sensor showed that the measurement error of the gas pressure and temperature were of 0.068 MPa and 0.19 ℃,respectively.The sensor has high sensitivity,low cost,simple and compact structure.It has certain application value in industrial production.