To look for new materials that are suitable for improving the weather-resistance of brick cultural relics, and to develop systematic protection methods and experiences. After determining the main causes of weathering and salt-recess of brick cultural relics, tests were conducted using various materials to provide resistance to damage by water, acid, salt, pollution, heat and ageing, and ultraviolet rays. More than ten kinds of polymeric materials were tested and the best of these were selected as protective and reinforcement materials. The polymeric material Si-97 selected by these experiments was applied to weathered and salt-damaged brick cultural relics. This material protected and reinforced the damaged brick cultural relics to a certain degree, not only lengthening the lifetime of the brick cultural relic, but also reducing the maintenance costs. The achievement of the research is innovative. The innovative feature of Si-97 is that it incorporates amino and epoxy groups into the silicone polymer which increases its flexibility, thereby reducing its fragility, and improving the ageing-resistant performance of the material. In view of better protection effects, obvious social and economic benefits, the selected material Si-97 is proposed to be promoted for application.