Abstract: The application of cold recycling technology for foamed asphalt is to add cold water in high temperature asphalt to make hot asphalt mix with water. When the water temperature is heated, the asphalt is cooled. The heating process of water vaporizes it to form steam to maintain the stable area of asphalt. Bubbles are absorbed under the action of surface tension, so that the asphalt tension and vapor pressure are inequilibrium in a short time. When the foam is in contact with aggregate, the fine aggregate surface is spread, so that it has good covering ability between aggregates and can form a large number of joint sealants. After mixing and rolling, it forms a good structural strength and plays a stable role in the mixture. In developed countries, the application of foam asphalt regeneration technology was earlier. Under the condition of increasingly serious environmental problems and higher global temperature, the demand for foam asphalt technology has increased at home and abroad. Through the application of this technology, the research on the paving quality control of cold recycled mixture and asphalt foaming in the engineering field has been successful, and the actual measurement and construction experience have been accumulated. Based on the continuous research of technology, it provides a theoretical and operational reference for the application of cold recycling technology of foamed asphalt in China.