| Bemisia tabaci B-biotype is one of the most destructive agricultural insect pests in recent years .It has now spread across almost the entire country in China, with serious influences on the agriculture production, since it was first reported in south China in 1949. Although great achievements have been made in ecology and behavior research of B.tabaci recently, it is still worthy of study further. This paper mainly researched on the effects of temperature on B.tabaci movement, and also on B.tabaci thermotaxis . The conclusions are as follows:1.The movement behavior of B.tabaci (both adult and nymph) had a close relation to temperature condition. Movement behavior of B.tabaci correlated positively with temperature increased under temperature gradient (15℃, 20℃, 25℃, 30℃and 35℃). Percentage of active individuals increased with the temperature from 15℃to 35℃, The movement behavior of the 1st instar nymph of B.tabaci also related to temperature changes. Lengths of maximum and average move paths of 1st instar nymph of B.tabaci at high temperatures are far more longer than those at low temperatures. They are more widely distribute at higher temperatures than those at low after the 1st instar nymph of B.tabaci probe the leaf and stop moving. The study on dispersal potential under temperature gradient showed that the same result on this temperature zone.2.The study on thermotaxis of B.tabaci showed that B.tabaci have thermotaxis to low temperature and distributed mainly over the range of low-temperature zone from 10℃to 40℃.There is no certain preference temperature founded in this study. But distribution on different zones had slightly differences among different temperature gradients, and their aggregation under temperature gradient changed slightly after hot and cold acclimation.
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