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A Mach-Zehnder interferometer (MZI) based on two spherical structures is proposed and temperature and humidity are measured simultaneously.The device is fabricated by inserting two spherical structures into a single mode optical fiber (SMF).The results of the experiment indicate that the temperature sensitivities are 0.079 nm/℃ and 0.090 nm/℃ from 10 ℃ to 60 ℃,respectively.When the humidity changes from 30％ to 70％,the humidity sensitivities are 0.148 nrm/％RH and 0.06 rnm/％RH,respectively.Therefore,temperature and humidity are measured simultaneously by the sensitive matrix.The new structure is demonstrated to be a particularly useful approach to detect temperature and humidity.