Abstract: In order to explore the density effects of intraspecific competition on the population growth of Assara inouei, the biological charactristics of the developmental duation, survival rate,reproduction rate and life table parameters were examined by rearing larvae at the densities of 1, 5, 10,15, 20 and 25 larvae · dish-1（Φ=9 cm） under laboratory conditions. The results showed that pupal mass of male and female and the average number of eggs per female decreased significantly as the larval density increased. Larval density had no significant effect on pre-pupal duration, adult eclosion rate,female to male adult sex ratio and hatching rate of offspring eggs. When the larval density was 15 larvae · dish-1, the larval development was the best, the survival rate and pupation rate were 65.67% and98.83%, respectively, the larval duation and pupal duration were 18.32 d and 7.01 d, respectively,oviposition duration of adult was 7.61 d, and the population growth index was the highest（26.52）. When the larval density was greater than 15 larvae · dish-1, the survival rate and pupation rate of larvae were significantly reduced, the larval duation and pupal duration were significantly prolonged, and the oviposition duration of adult was significantly shortened with the increase of larval density. When the larval density was 25 larvae · dish-1, the larval development was the worst, the survival rate and pupation rate were 36.12% and 76.67%, respectively, the larval duation and pupal duration were 20.36 d and8.56 d, respectively, oviposition duration of adult was 5.29 d, and the population growth index was the lowest（4.57）. The larval stage of Assara inouei had a density restriction effect and a density critical value. When the larval density was higher in a limited space, an obvious density effect would occur,which significantly reduced the population of this pest.