A fiber optic tilt sensor based on Fabry Perot(F P) interference is proposed. The sensor is composed of single mode fiber and capillary. Firstly,we analyzed the principles of optical fiber interference and tilt sensor；then,made a packaged optical fiber tilt sensor and completed the tilt experiment of the optical fiber F P sensor finally. Through the analysis of the collected data,we obtained the response characteristics of the sensor tilt angle,and explored the influence of temperature on the wavelength shift of the sensor by the temperature experiment.The experimental results shows that there is a linear relationship between the measurement angle and the reflected wavelength in the range of 0°～10°,with the dip sensitivity of 0.2031 nm/°,and the linearity of 0.99707. When the temperature sensitivity is 4.777 nm/℃,the linearity is 0.99934 in the range of 45℃ to 49℃. The sensor is of simple structure,low cost and high sensitivity characteristics,and has a broad application prospect.