A temperature sensor based on optical fiber Fabry-Pérot（ F-P） interferometer is proposed. The sensitive part of the sensor is a single mode fiber with both ends are grinded to plane. One end of the sensitive fiber is connected with another single mode fiber to form a reflective surface. The other end of the sensitive fiber is exposed to air to form another reflective surface. The two reflective surfaces and the sensitive optical fiber constitute an intrinsic optical fiber F-P interferometer（ IFPI）. Temperature response characteristics of the optical fiber temperature sensor is analyzed

optical fiber temperature sensor principle prototype is manufactured and test platform is built up

test on prototype is performed

. The temperature sensor is calibrated at temperature range of25

30 ℃. The temperature sensitivity is 21. 504·2π rad/℃ and temperature resolution is 0. 046 ℃. Experimental results demonstrate that this sensor has good linear response to temperature and high sensitivity. This kind of sensor has a good application prospect because of its simple fabrication process and low cost.