Weathering steel has excellent corrosion resistance, but the formation time of stable rust layer is too long. Stabilizing the surface of weathering steel before service can shorten the formation time of stable rust layer, meanwhile, avoid the rust liquid hanging and scattering. The development history of weathering steel and the formation, structural composition and protection mechanism of rust layer is briefly summarized. The research status of stabilization treatment technology of rust layer of weathering steel is mainly introduced，with the key points of this technology put forward. Finally，its future development is prospected.