Abstract: To calculate the optical properties of uniaxial crystal F-P filters, with theoretical analysis, the boundary condition of the electric field of the film at the interface of ordinary light and extraordinary light, vertically from the optical axial to the incident plane of single uniaxial crystal film, and the phase of the electric field of the film at the interface were analyzed. The calculating method of reflectivity and transmission of single crystal film was obtained. After the simulation of optical property of uniaxial crystal F-P filter, the data of the filter transmission changing with the optical axis direction was obtained. The results show that optical axis rotation angle has obvious effect on the transmission peak of F-P filter.