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In order to study the relationship of material's physical properties and materials special facet, the special facets need to be obtained firstly. La0, 5 Ca0, 5 MnO3 microcrystals with different morphologies were obtained by hydrothermal method using different concentration of urea, KOH and adjusting the reaction temperature. Characterization methods of powder X-ray diffraction (XRD), scanning electron microscope (SEM) were used to show the crystal structure and morphology information for as-prepared products. The synthesis condition and reactant concentration play important roles in crystal facet tailoring process. The optimal route to prepare octahedral shape of La0, 5 Ca0, 5 MnO3 microcrystal was discussed and its corresponding facet tailoring mechanism was also set up, which is important for further study and application on the relationship of structure and properties of perovskite structure oxides. [ABSTRACT FROM AUTHOR]