Synthesis of the non-swelling property micas was carried out by hydrothermal method. In order to artificially induce the diffusion of ions, a rotating system was attached to the hydrothermal apparatus and by adding 0.7 mm zircon beads, synthesis of the non-swelling property micas could be performed in a low temperature area. The hydrothermal conditions for the preparation of micas were a reaction temperature of 260 o C, for 72 hrs, using 1K2O, 1Al(OH)3, 4Mg(OH)2 and 6SiO2 as the starting materials and a 8M-KOH solution as the hydrothermal solvent. The micas obtained under these conditions were a plate shape with a size of 2.89 μm and showed a whiteness of over 97 %. Also, through the FT-IR analysis, because the absorption peak of the Mg3OH vibration was observed at approximately 3700 cm.1 , it could be known that it was phlogopite of non-swelling property showing the chemical composition of KMg3AlSi3O10(OH)2. This result was very consistent with the EDS analysis where O (41.34 %), Mg (3.88%), Al (11.45 %), Si (17.62 %) and K (25.71 %) elements were detected.