Effects of temperature (15,20,25 and 30℃) and Scenedesmus obliquus density (1.0×10⁶,3.0×10⁶ and 5.0×10⁶ cells/ml) on life history parameters including life expectancy at hatching,generation time,gross reproductive rate,net reproductive rate,intrinsic rate of population increase and proportion of sexual offspring of Brachionus diversicornis were studied by means of individual culture.Results showed that temperature affected significantly life expectancy at hatching,generation time,gross reproductive rate,net reproductive rate and intrinsic rate of population increase,but did not affect proportion of sexual offspring.Food level affected markedly gross reproductive rate and net reproductive rate,but had no effect on life expectancy at hatching,generation time,intrinsic rate of population increase and proportion of sexual offspring.The interaction between food level and temperature did not significantly influence all the life table demographic parameters.Both the life expectancy at hatching and the generation time decreased with increasing temperature.The lowest and highest net reproductive rate was obtained at 15 and 30℃,respectively;while with no difference between 20 and 25℃.The gross reproductive rate was lower at 15℃ than those at 20,25 and 30℃, and no difference was observed among those at the latter three temperatures.Both the net reproductive rate and the gross reproductive rate were higher at 3.0×10⁶ cells/ml than those at 1.0×10⁶ and 5.0×10⁶ cells/ml of Scenedesmus obliquus,and those at the two latter food levels were similar.