In order to simplify the fiber Bragg grating strain test demodulation, this paper presents a LabVIEWbased strain test system data acquisition software and data analysis and processing software. Firstly, the test principle of the fiber Bragg grating sensor is introduced. Secondly, the fiber Bragg grating wavelength demodulation scheme based on the threestep phase shift demodulation algorithm is determined according to the actual measurement. The phase unwrapping phase phase is solved and the actual Into a linear relationship between the phase value, the final solution of the strain. Finally, the cantilever beam and resistance strain gauge test to verify.