[Objectives]  Ovarian development in Calliptamus italicus (L.) was studied and the relationship between ovarian development and temperature explored. [Methods]  Ovarian development was observed both in animals kept outdoors and in those kept at constant temperature indoors. [Results]  Results show that C. italicus ovarian development can be divided into five main stages (Ⅰ, Ⅱ, Ⅲ, Ⅵ, Ⅴ), that stageⅡcan be subdivided into an early and end stage and stage Ⅲ into an early, middle, late and end stage. The length of ovaries grew steadily in the early and rapidly in middle and late stages, but ovarian width grew slowly during the whole process. Mating behavior occurred at the end of stage Ⅲ (70%) and stage Ⅳ (30%). Ovarian development was completed once, or twice, under constant temperatures of 26, 29, 32 and 35℃. There was a significant, negative, linear relationship between the first ovarian development duration and the second (P<0.01). Under the same temperature, the duration of early ovarian development was longer than that of later development, and the fecundity of early developed ovaries was higher than that of those that developed later. In outdoor natural conditions, ovarian development was completed 1-5 times, and fecundity was higher than that observed under constant temperature indoors. [Conclusion]  C. italicus ovarian development was completed in the middle and late stages. 23℃ was unsuitable for C. italicus ovarian development, a range of temperature of 26-35℃ was suitable, of which the most appropriate was 32℃.