How to solve the optical fiber transmission dispersion compensation, as well as to achieve high-speed data-intensive wave of all-optical time division multiplexing and multiplexing solution, become a major problem during the study. Fiber Bragg Grating(FBG)is an ideal passive sensing and signal demodulation device, the lateral force characteristics of fiber Bragg grating was explored, and an experimental system ASE100 source was built. Demodulation results show that：loss of polarization had maximum transmittance spectrum of the main stop band; split point was linear relationship with size of the force, and generated to move with the periodic variation of the force; different temperatures did not change the shape of the loss of polarization, but it was generated at the position of the wavelength axis. The research results for the clear fiber Bragg grating lateral force has significant reference value.