Abstract: This paper studies effects of sludge solidified with paper sludge ash(PS ash) and cement. The main factors are about the contents of PS ash and cement which influence solidified sludge mechanical properties and permeability. Multiple methods are used to conduct permeability tests and hydrostatic leaching tests by adding PS ash and cement. Final, the paper analyzes the change rule of hydraulic characteristics of solidified body with influencing factors. Test results show that:the unconfined compressive strength of the solidified sludge has a "staircase" distribution with the contents of PS ash and cement. The permeability of solidified sludge reaches the minimum as 0.48×10^-5cm·s^-1, when the contents of cement and PS ash are 20% and 17.5%, respectively. When the content of PS ash is certain, the content of metal ions decreases as the increasing of cement content. PS increases the ash content for curing Cd and Cu ion effect when the cement content is between 8%~12%. The curing effect of other metal ions is shown the best when the cement content is above 12%, and decreased as the increasing of the content of PS ash.