In order to take into account of higher temperature sensing sensitivit y and larger measurement range,we proposed atemperature sensor based on the vernier-effect of cascaded Fabry-Perot interferometer (FPI) and Mach-Zehnder interferometer (MZI),and ca rried out by experiment.The FPI used in the experiment is composed of two sections of single -mode fiber and a quartz wave plate coated at both ends.Its structure is stable and not affecte d by the vibration of the incubator,so it is used as a temperature sensing element.MZI filter is made up of two 3dB couplers.By controlling the length of the two arms,the free spectral rang e (FSR) is close to the FSR of FPI, so that the temperature sensing sensitivity can be amplified in a cascaded manner based on the vernier-effect.The experimental results show that the temp erature sensitivity of the cascade interferometer is 72.4pm/℃ under the temperature change of 20℃— 70℃.Compared with a single FPI (8.72pm/℃),this structure magnifies the sensi tivity of temperature sensing by 8.3times and has a larger measurement range.The experimental results are co nsistent with the theory.