Abstract: The effects of lighu intension and leaf age on feeding process of the whitefly,Bemisia tabaci(Gennaidus),were studied.It was found that the feeding behavior of the whitefly was dominant among other activities and strongly affected ovipostion and mating behavior of whitefly.The oviposition behavior was not independent and occured with feeding behavior together.The feeding preference was major cause of eggs distribution on host leaves with different ages.Intensive light could induce mating behavior of male,however,the female had no this response.It also was revealed from the results that the dominant feeding behavior was resulted from whitefly as a generalist relying mainly on population fecundity for host adaptation instead of the physiological specialization.