Abstract:Coccophagus ceroplastae is one of the important parasitoids of Parasaissetia nigra. In this paper, the development， fecundity per female and parasitism rates of C.ceroplastae were studied at different constant temperatures and photoperiods, respectively. The results showed that temperature and photoperiod had significant effects on population growth of C.ceroplastae. C.ceroplastae could not complete its life history at 32℃.The development rate increased significantly with the increase of temperature between 18℃ and 27℃. The development duration were the longest at 18℃ (54.0d) and the shortest at 27℃ (22.8d).The thermal threshold and effective accumulated temperature of C.ceroplastae were 12.76℃ and 307.62 day-degree, respectively. High and low temperatures were not suitable for the parasitisation of C.ceroplastae. The parasitism rate of C.ceroplastae was the highest at 21℃(36.0%) and the lowest at 30℃ (4.5%). Giving the development duration, body length, parasitic rate and fecundity per female, 21-27℃ was optimal for the development and reproduction of C.ceroplastae, while the temperature over 30℃was not suitable for its survival and development. C.ceroplastae was sensitive to the photoperiod. The development rate and fecundity per female increased with the increase of illumination time. The development duration was the shortest (24.8d) at the condition of L∶D=16∶8h and the longest (27.8d) at the condition of L∶D=10∶14h.The fecundity per female was the highest (119.6 eggs) at the condition of L∶D=16∶8h and the lowest (86.2 eggs) at the condition of L∶D 10∶14h. Giving the development duration, fecundity and parasitic rate， L∶D=14-16∶8-10 h was most suitable for the population growth of C.ceroplastae.