According to a previous study, the hydrothermal method used by other researchers [Georgescu et al.(2000), Larbi et al. (2010) ] for synthesizing Dicalcium silicate. Discovered that hydrothermal–calcination process it to better results. The cement has a specific surface area and properties hydraulics better. This results in the ability to compressive strength than normal combustion synthesis (Pimraksa. (2009)). Microwave considered one of the hydrothermal. The microwaves cause the oscillations of the particles. Thus allowing chemical reactions occur at lower temperatures (Lekse et al., 2007), the advantages of this technique is to use a short time. Cheap and fast