A double-grating combination structure based on equi-intensity cantilever is adopted to achieve simultaneous measurement of temperature and stress. Select two fiber Bragg gratings of the same batch of production with consistent parameters, paste them to the upper and lower beam surface, respectively. The upper and lower beam grating suffers from equivalent stress but in opposite direction, resulting in two reflection peaks to achieve the simultaneous measurement of temperature and stress. The measured grating temperature sensitivity coefficient is 0.1346 nm/°C, the upper and lower beam raster error is only 0.0001 nm/°C, and the stress sensitivity coefficients were 0.4085 nm/N, －0.4089 nm/N, separately, errors are only 0.0004nm/N. The experiment result shows that the method is practical and has a simple craftsmanship, moreover, it overcome the traditional double-grating combination disadvantage that is difficult to ensure the accuracy of measuring position.