A dual-parameter fiber-optic sensor based on Fabry-Perot interferometer (FPI) structure is described and demonstrat ed 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 spectr um to track their wavelength changes with gas pressure or temperature,constructing transport matrices capabl e of measuring both gas pressure and temperature and eliminating mutual cross-sensitivities.The experimental re sults showed that the gas pressure and temperature sensitivity at dip 1were of 2.925nm/MPa and －1.165nm/℃,and the gas pressure and temperature sensitivity at dip 2were of 4.715nm/MPa and －1.209nm/℃,respecti vely.Building the measurement matrix using the gas pressure and temperature sensitivity of dip 1a nd 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 0.068MPa and 0.19℃,respectively.The sensor has high sensitivity, low cost,simple and compact structure.It has certain application value in industri al production.