Based on the principle of fiber Bragg grating（FBG）and optical time-division multiplexing（OTDM）

a high-speed demodulation scheme for the matched-grating strain sensor network is proposed.Ultra-high speed demodulation system for multiple FBG senor channels is achieved using FPGA+ARM circuit design.Especially

the noise effect brought by either light path or circuit is significantly suppressed using a composite filtering algorithm

and the variation range of the peak power is reduced from-1.03dB to-0.31dB.The designed system can be used in various environments and has important reference value.