In the Yangtze basin where is in the north of everygreen magnolia family living area,the study on frost injuries and the measurement of inflection point temperatures of electrolyte leakage from 16 everygreen magnolias leaves were carried outin successive four winters. A mathematical model for plant cold acclimation was established in the former paper [25] according to the linear relationship between the inflection point temperatures of over winter leaves of tangerine and minimum air temperatures of the day ...