Abstract: The vines of "Muscat Hamburg" grape were collected in different periods during winter, and their electric conductivity, electric resistivity, water content and specific gravity were determined. The results of regress analysis indicated that the vine death rate was negatively correlated with its electric conductivity, water content and specific gravity, and positively with its electric resistivity. These facts showed that the main cause of vine death was the great water loss of the vine. The principal meteorological factors causing the vine death were the day number of relatively low humidity (<30%), the total heat summation of the soil temperature (below 0°C) in 10 cm depth and the number of day with wind the speed of which was over and above the average wind speed in the winter of the year. If these three meteorological factors respectively reached the levels (26days,-153.7°C and 80 days), the vines would completely die.

Key words: Grape, Electric conductivity, Water content, Meteorological factors