Under hydrothermal conditions, the ionic product of water is thousands of times that at room temperature and pressure, making this technology capable of reproducing the lithification process of long-accumulated rocks in a laboratory setting over a short period. This technique can solidify municipal solid waste incineration ash into products with higher strength than general cementitious materials, while meeting China's environmental standards for the leaching of heavy metals and other harmful substances. (1) By simulating the lithification principles of accumulative rocks, hydrothermal low-temperature solidification of municipal solid waste ash results in a safe and reliable material with high strength (several times that of ordinary cementitious products) and low heavy metal leaching (leaching meets national environmental standards); (2) Achieving 100% recycling of municipal solid waste ash, which means maximizing the utilization rate (100%) by only adding fly ash (20%) to hydrothermally solidify the bottom ash of the garbage (ash composition: about 20% fly ash and 80% bottom ash); (this is very rare in international research); (3) Through the activation treatment of municipal solid waste ash, it is possible to achieve low-temperature ( 100-150°C) under atmospheric pressure hydrothermal curing of domestic waste ash. This allows the curing process to be separated from a high-pressure autoclave, and the process can be designed as a continuous one. It greatly reduces the cost of reuse and initial investment, making it easy to popularize and promote. Application or application prospects: resource recovery and reuse of inorganic solid wastes (waste incineration ash, fly ash, construction waste, river silt, steelmaking slag, etc.). The research group has already conducted cures on waste materials such as domestic waste incineration ash, fly ash, Yellow River silt, and steelmaking slag. After hydrothermal treatment, these wastes can be cured into products with higher strength than general cement products, and the leaching of heavy metals and other harmful substances meets China's environmental requirements.