The removal of lead in fly ash from municpal waste incineration by the solvothermal reaction and the utilization of the fly ash by solvothermal hot-press treatment were studied. This process involves both high-temperature and high-pressure aqueous treatment of the fly ash in order to accelerate metal hydrolysis as a result of the increased ion product constant of water. Under solvothermal conditions of 473 K temperature and 20 MPa pressure, 19% of lead in the fly ash was removed a 60-min reaction. On the other hand, under alkali solvothermal conditions created by adding 1.5 mol/l of NaOH. The solvothermal hot press at the conditions of 20 MPa pressure and 523 K temperature for 60 min treatment resulted the product having 40 MPa compression strength, 7 MPa tensile strength and 22 HR 15 W Rockwell hardness. Furthermore, by mixing fly ash with glass at a 50% ratio, the compression strength, tensile strength and Rockwell hardness of the product increased to 80 MPa, 13 MPa, 80 HR 15 W, respectively. The values of these physical properties are comparable to those of mortar cement, artificial aggregates and artificial lightweight aggregates. These results demonstrate, the applicability of the solvothermal treatment to stabilization and utilization of the incineration fly ash.