Radar and optical dual band-pass film material can be fabricated by the method of loading frequency selective surface into metallic mesh substrate. In this paper its electromagnetic characteristics are analyzed and calculated by the vector mode matching method. Using substrate, metallic mesh and frequency selective surface integration design method, its electromagnetic characteristics are optimized. The calculated and measured results show that optically transparent frequency selective surface which is designed by the integration design method can not only quickly obtain the electric field basis functions but also accurately predict the resonant size, therefore, the computational efficiency is improved and the occurence of the modal interaction null is avoided. With integration design method, optically transparent band-pass frequency selective surface having a stable filter characteristic is obtained in this paper.