Effects of the conductivity of transparent conductive film on the optically transparent band-pass frequency selective surface (FSS) are investigated by using Galerkin's method in the spectral domain. According to the results of the calculation and measurement, it is found that the conductivity of transparent conductive film mainly affects the transmission coefficient at the resonance frequency in radar wave band. The optically transparent band-pass frequency selective surface can transmit optical band and reflect radar wave band, however, it can also selectively transmit the radar wave.