Using the bisphenol E cyanate ester (BECE) and hydroxyl-terminated polyether sulfone (Mx) to co-modify novolac-cyanate ester (Novolac-CE) resin, and laminating with quartz cloth, a 400℃ temperature resistant and low dielectric loss supported structural adhesive film for bonding advanced radar radomes is developed. The results show that the impact toughness of Novolac-CE can be increased to 13 kJ/m², and the contact angel decrease to 72.8°with the addition of suitable amount of BECE and Mx in Novolac-CE resin. The adhesion strength between the disposed quartz cloth by the KH550/ethonal solution and Novolac-CE can be 70% higher than original quartz cloth, but the excessive KH550 is negative for the thermal resistance of film. The lap shear strength of the film is measured to be more than 5 MPa at 400℃, where it can be continuously used for 60 min, the dielectric loss is 0.014 (10 GHz). The adhesive film has a shelf life of more than 15 days at ambient temperature and suitable tackiness, which can be applied as high temperature transparent materials.