In order to explore the effects of molding shape and landfill method on the leaching of heavy metals in the solidified fly ash of municipal solid waste incineration, the size of solidified body was set to 10×10×10cm, 10×10×2.5cm and DN=3cm (sphere) respectively, and at the same time set two landfill methods-orderly stacking and scattered stacking-for dynamic leaching test. The results showed that the leachate pH between spherical shape and cuboid shape, orderly stacking and scattered stacking were significantly different before the solidified body cracked; The cumulative leaching amounts of Pb, Zn and Cr per unit mass of solidified body increased with the increase of solid-liquid contact area, scattered degree of landfill and liquid-solid ratio. The leaching of solidified and stabilized fly ash conformed to the shrinking core model and was mainly controlled by the diffusion process. The two kinds of rate constants of Pb, Zn and Cr were positively related to solid-liquid contact area, scattered degree of landfill and liquid-solid ratio. Therefore, it is necessary to reduce the leaching of heavy metals from the raw ash of municipal solid waste incineration plants and improve the security of co-disposal of solidified and stabilized fly ash in the landfill sites. The surface area of solidified body should be minimized. And the solidified body should avoid being buried by using a scattered landfill method.