With sintered magnesia and synthetic magnesia as the main raw materials, modified powdered asphalt and phenolic resin as binders, nitronaphthalene as glidant, and appropriate amount of wetting agent, a large-surface repairing converter has been developed. material. The test results show that the repair material has good high-temperature fluidity, fast automatic leveling, short hardening time, high bonding strength, long service life, and low environmental pollution.