Amorphous calcium carbonate (ACC) was synthesized by reaction to the Ca(OH)$_2$- $C_2$ $H_{5}$ OH-C$H_2O$HC$H_2O$H-$CO_2$ systems. The ACC was then crystallized in aqueous solutions while observing the changes in crystal phases. Using 1L/min of $CO_2$ flow rate, 600rpm of stirring rate and various concentrations of Ca(OH)$_2$ as the conditions, the reaction was divided into three stages according to changes of electrical conductivity that depends on $Ca^{2+}$ concentration. ACC synthesized by these reactions was stabilized to calcite through vaterite according to time. When crystallizing the ACC in an aqueous solution, it was transferred to calcite by means of a low stirring speed regardless of temperature. However, a small amount of aragonite was obtained with higher stirring fate at high temperatures. Furthermore, the addition of N $H_{4}$$^{+}$ ions resulted in an irregular shape and size of the produced calcite, while $Mg^{2+}$ ions enhanced aragonite production.ion.