A spatial/wavelength division multiplexed 3×10 fiber Bragg grating sensor array, acted as the reflector of a ring cavity fiber laser, was interrogated by employing a 1×3 optical switch and a tunable F P filter. Demodulation was achieved by using an unbalanced Michelson scanning interferometer that transform the wavelength shift signal induced by the measured strain into phase shift signal. The sensor sensitivity of the system was demonstrated to be 1 6817 Deg/με, which agree with the theoretical value of 1.6843 Deg/με well. A feedback subsystem was introduced to make the system track the measuring channel automatically.