The low grade domestic kaoline, such as pink-C and white-D, was converted to metakaoline, which has pozzolanic reactivity by heat treatment in the temperature range of 600℃ to 1000℃ for preparing the spacer. The spacer was used for supporting the reinforced steel rod during construction to improve the safety of architecture. Pink-C and white-D were completely dehydroxylated when burnt at 800℃ for 1 hour and converted to metakaoline. The compressive strengths of specimens added calcined pink-C were lower than those of press molding mortar products inspire of calcining conditions. When white-D with calcined 800℃ and 1000℃ for 1 hour was mixed 30% in the weight ratio of cement, the specimens cured 28 days had 338㎏/㎠ and 347㎏/㎠ of compressive strengths respectively.