A long-period grating in photonic crystal fiber was imprinted by mechanical pressure using flat broadband supercontinuum as light source and periodic metal wires on which tunable period can be produced,and the relationship of the depth of pulse transmitted spectrum and the pressure was investigated.The experimental results show that when the pressure varies between 20 and 60 N,the linearity degree of the pressure-transmission peak attenuation curve is as much as 0.995 3 and the sensitivity is 0.5 dBm/N.