Abstract: The spatial pattern of Bemisia tabaci adult population inhabiting on cucumbers was analyzed by calculating six indices of aggregation, and parameters of Iwao model and Taylor’s power law model from July to August in 2006. The correlations of different aggregate indices value with mean densities were evaluated. The k value of negative binomial distribution which was shown to be poorly correlated with densities was chosen to describe the temporal dynamics of Bemisia tabaci adult population. The results showed obvious difference was found in the intensity of aggregation of its adult population during the life span of the cucumber growth. The population on horizontal spatial changed from loosely to highly aggregated, and then to loosely, to highly aggregated again. The highest number of its adult population inhabiting on hundred cucumber plants was 23359 and the lowest was 1908. The population on vertical spatial changed from highly aggregated to loosely aggregated, and then to highly, to loosely aggregated. The largest number of B. tabaci adult individuals harbored on hundred plants was on the eighth leaf, which was 9093, and the second number was on the ninth and the seventh leaf, which were 8488 and 8353 respectively. Throughout the incidence of stage B. tabaci inhabiting on cucumbers, the spatial pattern of its population aggregated and diffused alternatively. Based on the study the spatial distribution pattern of B. tabaci adult population, the most suitable sampling intensity is established.