SA-1 low-viscosity silicate in permeable crystalline mortar waterproof agent can penetrate into the base level and react with the water and calcium ions in the capillary pores to generate calcium silicate crystals (CSH) to block the capillary pores and subtle cracks of the concrete, thus compacting the mortar, form a protective layer on the surface and inside of the mortar, and play a waterproof role.