In summary, this paper proposes an accurate and fast design method to design a narrow bandpass optical transparent FSS. Two structural parameters are optimized under the design goals by this method and are verified to be close to the design goals by full-wave simulation, with the losses of transmission peaks less than 1.5 dB at the desired frequency, the out-of-band suppression larger than 20 dB, the quality factors of transmission peaks larger than 26, the visible light transmittance acceptable, and the structure not sensitive to polarization angles. In addition to optimizing the structural parameters of the bandpass optical transparent FSS at the desired transmission frequency point, this design method can also be used to optimize design goals of different optical transmittances and dielectric materials, or a multi-layer FSS that consists of media and metal grids. Therefore, this method can effectively optimize the structural parameters of the FSS composed of dielectric and grid structures under desired design goals, greatly reduces the design time of the metal grid type FSS, and provides convenience for the design of the FSS.