A method for making a ceramic heat sink is provided. In the first step of the method, a mixed material of nitrite-based ceramic powder, titanium powder and inorganic resin is prepared. The mixed material is then molded into a ceramic blank with a mold coated with titanium. Thereafter, the ceramic blank may be sintered to form the ceramic heat sink. Since the mixture and the mold both contain a common material of titanium, the molded ceramic blank can be easily removed from the mold in its integrity.