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Annual leaf segments of eight Camellia species were used to study the heat tolerance by electrical conductivity method,in combination with Logistic equation to ascertain the semi-lethal high temperature by fitting the cell injured rate curve.The relationship between the processing temperature and cell injured rate in Camellia showed a typical"S"shaped curve,following Logistic model with the correlation coefficient above 0.95 through the significance test.The semi-lethal high temperature LT50 of the eight Camellia species,determined by the inflection point on curve,varied from 50℃ to 57℃,following the descending order: Camellia oleifera>Camellia japanica>Camellia polyodonta>Camellia semiserrata>Camellia nitidissima>Camellia gigantocarpa>Camellia nanyongensis>Camellia vietnamensis.The semi-lethal high temperature of Camellia oleifera was 56.8℃ which was the highest,and Camellia vietnamensis was the lowest,50.6℃,which showed that Camellia oleifera was the best species which suitable to be introduced to high-heat zone and Camellia vietnamensis was more suitable for planting in temperate regions of lower temperature.All these results of the study can provide theoretical basis for breeding and introduction of heat-tolerant oil-tea cultivars.