In this work, we investigated clay and raw materials from China (black clay, red clay, white clay) and Korea(Cheonan clay, Obu clay) used for the manufacture of porcelain products. According to chemical analysis results, feldsparcomponents containing CaO, K2O, Na2O and quartz are found in clay materials besides primary clay such as kaollinte, forthe clay materials from Korea, which is found more in clay materials from Korea than from China. For the Fe2O3 content,governing whiteness of porcelain products, more iron oxide (> 5 %) is found in Korean clays (Cheonan clay, obu clay, redclay) compared to those form China (black, white clay). Through X-ray diffraction analysis, kaolinite and Halloysite arefound to be main phases for all the raw materials and second phases such as quartz and pyrophyllite are found. Using theseclay materials, raw materials for porcelain products were produced, and the physicochemical properties were investigatedfor sintered samples. Absorption rate is in order of Baekja-A < Baekja-B < Yeonbuncheong < Jinbuncheong < Cheongja, andthe sample, sintered at 1250oC in reductive atmosphere, exhibits the lowest absorption rate. Comparing the color of thesintered samples, the samples sintered in oxidative atmosphere (L*value: 86~95 %) show higher whiteness value than thosesintered in reductive atmosphere (L*value: 81~93 %). For the Cheongja and Buncheong, the samples sintered in reductiveatmosphre shows higher whiteness, L*values, and low a*/b*value, which is due to reduction of iron oxide (Fe2O3).