Pueraria wallichii, as a pione er tree species in dry-hot river areas in Yunnan was planted in a large scale. It has many merits, such as it can resist to drought but not to cold, grow fast in warm areas and can easily sprout. A frosty disaster lasting in 1999 caused fr ost damage in different degrees to Pueraria wallichii. Based on the analysis on the frost injury in different areas, the paper concludes tha t (a) The plant can grow when the lowest temperature per day is higher 0 ℃; (b) It begin to suffer from frost injury, while the day continuing with lower than 0 ℃ of the lowest atmospherature per day exceed 3 day and its injury degrees var y with altitude and landform. The injured plants can sprout next spring even if the parts of above ground wilt.
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