The physicochemical properties and sensory characteristics of red pimiento kakdugi (radish kimchi) during fermentation at 1$0^{circ}C$ were compared with red pepper kakdugi (control). The fermentation patterns of two kakdugies were similar, although total acidity, reducing sugar content and lactobacilli number of the red pimiento kakdugi were somewhat higher than those of control. The hardness and fracturability of the radish cubes of kakdugi were not significantly different from those of red pepper kakdugi during fermentation. The Hunter color L, a and b values of both kakdugies increased gradually until the 10th day, and then decreased thereafter. The AST A value and redness of red pimiento kakdugi were consistently higher than those of control, which is consistent with the sensory results. While red pepper powder kakdugi contains high concentrations of capsaicin and dihydrocapsaicin, in pimiento kakdugi capsaicinoids were not detected by HPLC analysis. Also, capsainoids in red pepper kakdugi decreased gradually as fermentation proceeded. Sensory evaluation showed that the score of hot taste for red pimiento kakdugi was lower, compared with that of control (p < 0.05), whereas the score of over-all acceptability for red pimiento kakdugi was higher than that of control.