Each insect species has an optimum temperature at which it will develop at its fastest rate, and this can vary for each stage of its life cycle. The present study was conducted to know the accurate data for total duration of life cycle of the pest Henosepilachna vigintioctopunctata on its preferred host plant Solanum melongena. For this study, matured adult beetles were collected from the brinjal field and the experiment was carried out at room temperatures of 28.9±0.73^oC. During the study, total fecundity, incubation, larval, pupal, pre-oviposition, oviposition, post oviposition periods, male and female longevity and morphometrics of eggs, grubs, adults were also noted. The total life cycle duration was recorded as 20-26 days with an average of 22.5±2.01days. According to other similar research articles, the temperature 28-30^oC would be an optimum temperature for the development and density of this pest population. The result revealed that the duration of the life cycle was completely related with temperature and the preference of host plant.