Abstract: The fiber Bragg grating has a wide application in the field of communication and sensing. According to the special structure of the tilted fiber Bragg grating, the effect of the tilted angle θ on reflection spectrum of tilted fiber Bragg grating was studied by using the couplemode theory and transfer matrix. The simulation result shows that the center wavelength of reflection spectrum moves to the longwavelength side, and the bandwidth and the reflectivity decreases with the increase of θ. The experimental result coincides with the simulation result. This conclusion is of great aid to the fabrication and application of the tilted fiber Bragg grating.