The hatching time of Artemia parthenogenetica of Aibi Lake at different temperatures is tested.According to the relationship between developmental rate and temperature, the mathematical model is established as following:V(T)=(k·T+c)·(1-exp(-(T-T_H)/r_H)), where V is developmental rate, T is temperature and other parameters are calculated based on the test data.From these, we compute the minimum and the average threshold of development (T_min-0, T_aver-0), the minimum and the average cumulative temperature (Q_min, Q_aver)are:T_min-0=5.56℃, T_aver-0=5.96℃, Q_min=342.47℃·h, Q_aver=413.63℃·h.Additionally, the different abilities at suiting temperature of cysts are discussed accomplishing with the fittesttemperature and high lethal-temperature.Finally, the signif icance of these factors in breeding aquatics was expatiated on.