The chilling tolerance of sweet potato cultivars was evaluated by the plant appearance at 5℃ for 14 days, and leaf relative water content, leakage, chlorophyll and malondialdehyde contents and Fv/Fm at 7/7℃ for 5 days and 24/20℃ for following 3 days. Cultivar 'Tainung 71', 'Okinawa 100', and 'Kinmen' are more chilling-tolerant, while 'Tainung 65', 'Simen 1', 'Hualien Purple Flesh 2', 'Satsumahikari', 'Yangmingshan Purple Flesh' and 'Japan Purple Flesh' are more chilling-sensitive.