An in-line Mach-Zehnder interferometer (MZI) is proposed and experimentally demonstrated for simultaneous measurement of temperature and directional torsion. The MZI structure is fabricated by fusion splicing a section of multi-core fber (MCF) between two segments of multi-mode fbers (MMFs). The temperature and torsion sensing characteristics are investigated experimentally. Simultaneous measurement of temperature and torsion can be realized by monitoring the wavelength shift and intensity variation of a resonant dip. (nhnhanh)