Abstract: In this experiment, chilling requirements of 92varieties of peach are studied and 0~7.2℃ teperature of different altitude in south of Sichuan Basin had been recorded. Results showed :(1)Chilling requirements of the 91varieties of peach are from 400 hours to 1300 hours. A majority of the varieties’ chilling requirements are from 650 hours to 950 hours. Flower buds’ chilling requirements are usually more than those of leaf buds’ in the same variety. Flower buds’ chilling requirements of the varieties change from 400 hours to 1300 hours, while the leaf buds’ are from 400 hours to 600 hours.(2)There are about 508 hours of 0~7.2℃ temperature in Lizhuang (300meters altitude), 748 hours in Nanguang(450 meters altitude), and 980 hours in Pingshanfurong(650m altitude) from Dec, 2003 to Feb, 2004.