This study was carried out to investigate the differences of sugar content and color onsweetpotato variety ‘Yulmi’ as applied by organic fertilizers like stevia extract and mixed organic fertilizer. Total free sugar content of steamed sweetpotato in the mixed organic fertilizer applied was the highestas 18.07 g 100g-1 D.W., and it was significantly high in order as stevia extract and chemical fertilizer. Fructose and glucose contents of steamed sweetpotato were not significantly different by the fertilizers,whereas sucrose content was significantly high in order as chemical fertilizer and stevia extract. Totalfree sugar contents of steamed and raw sweetpotato cultivated by chemical or organic fertilizer showedpositive correlation with sucrose content of raw or steamed sweetpotato. Glucose content of steamedsweetpotato treated by stevia extract showed positive correlation with chroma value a of the flesh, andmaltose content of steamed sweetpotato showed positive correlation with chroma value L.