[Objectives]  To investigate the effects of water and nitrogen fertilizer on the host preferences of Bemisia tabaci adults in order to provide a theoretical basis for the control of B. tabaci by regulating the amounts of water and fertilizer provided to its host plants. [Methods]  Four watering levels (250, 500, 750 and 1 000 mL/pot) , and four nitrogen concentration levels (0, 0.23, 0.46 and 0.92 g/kg) were evaluated, giving a total of 16 treatments. B. tabaci abundance was monitored and leaf water content measured. [Results]  (1) Host preferences of B. tabaci were significantly influenced by water quantity, nitrogen quantity, and the interaction between these two factors. (2) Host plants treated with 1 000 mL of water/pot/week and 0.92 g/kg nitrogen attracted the most B. tabaci adults; 202 adults per plant. (3) Water and nitrogen treatments could be ranked in attractiveness to B. tabaci as follows: Water; 1 000 mL>750 mL>500 mL>250 mL, nitrogen; 0.23 g/kg >0.92 g/kg>0.46 g/kg>0 g/kg. (4) There were positive correlations between leaf water content, water, nitrogen, and between B. tabaci abundance, water, nitrogen, and leaf water content. [Conclusion]  B. tabaci abundance increased with the amount of water and nitrogen fertilizer provided to host plants, which suggests that it may be possible to reduce the degree of crop damage caused by this pest by regulating the amount of water and nitrogen fertilizer applied to host plants.