This study was conducted to reclassify Cheongpung series based on the second edition of Soil Taxonomy and to dicuss the formation of Cheongpung series distributed on the diluvial terrace. Morphological properties of
typifying pedon of Cheongpung series were investigated and physico-chemical properties were analyzed according to Soil survey laboratory methods manual. The typifying pedon of Cheongpung series has red
(2.5YR 4/6) silty clay loamAp horizon (0-18 cm), red (2.5YR 4/8) clay BAt horizon (18-35 cm), red (2.5YR4/2) cobbly clay Bt1 horizon (35-65 cm), and red (2.5YR4/6) cobbly clay Bt2 horizon (more than 65 cm). The
typifying pedon has an argillic horizon fromadepth of 18 tomore than 65 cmand a base saturation (sumof cations) of less than 35%at 125 cm below the upper boundary of the argillic horizon. It can be classified as Ultisol, not as Alfisol. It has udic soil moisture regime, and can be classified as Udult. Also that meets the requirements of Typic Hapludults. It has 35%ormore clay at the particle-size control section, and have mesic soil temperature regime. Therefore Cheongpung series can be classified as fine, mesic family of Typic
Hapludults, not as fine, mesic family of Ultic Hapludalfs. Cheongpung series occur on moderately elevated diluvial terrace which have relatively stable geomorphic surface. They are developed as Ultisols with clay mineral weathering, translocation of clays to accumulate in an argillic horizon, and leaching of base-forming cations fromthe profile for relatively long periods underhumid and temperate climates inKorea.