Abstract: In this paper,the dynamics of Bemisia tabaci(Gennadius)on four host plants(e.g.cauliflower,cabbage,cucumber and tomato)were investigated.Our results showed that the number of eggs and nymphae of B.tabaci increased with the growth of host plants continually and peaked at 1th October,then it decreased gradually.However,the dynamics were different among the hosts and leaf sections.The number of eggs and nymphae of B.tabaci on the four hosts was tomato>cucumber>cauliflower>cabbage.In addition,eggs of B.tabaci were mainly on the upper and middle leaves,but the number on the upper was more and the difference between on the upper and bottom was significant.In the contrast,the nymphae were mainly on the middle and bottom leaves,but there was not significant on the upper and bottom.In the end,the adult densities were positively correlated with the daily mean temperature,but negatively correlated with the daily rainfall.