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- This paper was the research of high voltage suspension insulator (400 [kN]) including pottery stone, feldspar, clay and alumina of 17 [wt%]. The slurry was fabricated after ball milling mixed raw materials. Green compacts were made by the extrusion of jiggering method and were sintered at 1300[℃] for 50 [min.] in the tunnel kiln. The sintered density was reached to 97% of theoretical density, and the bending strength was 1658 [kgf/cm2] and hardness and fracture toughness which was measured by ICL( indentation crack length ) method were 1658 [kgf/cm2] and 27.5 [Gpa], respectively. In measurement of tan and insulation break voltage of 400 [kN] porcelain, tanδ took some numerical value between 17×10-3 and 61×10-3 and insulation break voltage value was 19.9±1.4 [kV/mm]. The test was performed to research whether the shape of pin affect a overvoltage break load or not . As a consequence, when a pin was designed a pin diameter 51 [mm] with the bottom form of two-step constructed with straight in the suspension insulator, Insulator showed overvoltage break load 52 [ton] of the highest value and reflected a fine characteristic in aged deterioration test which is one of the accelerated aging test. Also it could be confirmed a fine characteristic through performing the test that electrical property of insulator was established correctly in accordance with IEC 60383-1 standards.