In order to achieve precise control of phase shift amplitude and position in the echo spectrum of phase-shifted fiber Bragg grating(PSFBG) sensor,the method to control PSFBG sensor using mechanical micro-strain was proposed.There were micrometer screws,strain beams,phase shifting fiber gratings,demodulators,etc.in this method.The micro-strain control was performed by a micrometer screw,and the strain was transmitted to the PSFBG by the beam,thereby changing the echo spectrum.Finally,a functional model of spectrum offset and micro-displacement Δy was constructed.Experimental results show that stretching and compression can cause positive phase shift and negative phase shift of PSFBG,the phase shift fit curve is linear,and its comprehensive fit slope is 0.9914.The system can achieve continuous tuning of the phase shift by bending the micro-strain of the beam.The magnitude of the phase shift can be linearly controlled by changing the load displacement.The method is simple,high precision,large control range and passive.It has certain application value.