Dicalcium silicate has many polymorphs according to temperature. $eta$-dicalcium silicate which exists in cement is stabilized by minor components drived from raw materials regardless of temperature, such as high temperature and room temperature. K2O, SO3 and B2O3 are effective stabilizers for $eta$-dicalcium silicate at room temperature. B2O3 was the most effective stabilizer. Transformation from $eta$ to ${gamma}$ phase causes dicalcium silicate to change volume, resulting in dusting phenomenon. When B2O3 was used the phase transformation is the least than any other stabilizers. In addition, the starting temperature of quenching influences phases transformation : low temperature of quenching presented much phase transformation and decreased size of parameter of $eta$-dicalcium silicate.