Infrared-transparent glass is one of the key window materials for some important military applications. It′s still a great challenge to fabricate the infrared-transparent glass with high-properties and large size. With the great development of infrared technology and electro-optical countermining technique, the infrared windows with the capacity of radar latent and electro-magnetic shielding (EMS) are essentially required. In this paper, our philosophy is demonstrated to face the challenge in making infrared glass with high-properties and large size, and a new mid-infrared gallium oxyfluoride (FGa) glass is deveosped. Based on FGa glass, some new EMS techniques are developed to make the infrared-windows radar latent.