[Objectives]  To identify the optimal pupal age and storage temperature of pupae of the parasitoid wasp Tamarixia radiata in order to improve the biological control of the Asian citrus psyllid Diaphorina citri. [Methods]  The developmental morphology of 1 to 5 day old T. radiata pupae were observed, and the effects of being stored for 10 days at low-temperatures (2, 4, 6, 8 and 10 ℃) on eclosion rates under laboratory conditions recorded and compared. The fecundity of wasps developed from 3 day old pupae stored for 3, 6 and 9 d at 10 ℃, was also measured. [Results]  T. radiata has typical exarate pupa in which the body color and segments become darker and more distinct as pupae develop. The emergence rate increased with the age of the pupae when stored for 10 d. The emergence rates of 4 d old pupae at 8 ℃ and 3 d old pupae at 10 ℃ were 84.17% and 86.23%, respectively, similar to that of control pupae. However, since all adults emerged within 10 d, it is impracticable to store 4 d old pupae at 10 ℃ and 5 d old pupae at 8 ℃, for 10 d. The average first 20 d fecundity of females that emerged from 3 d old pupae stored at 10 ℃ for 3 d was 159.9 eggs, whereas those stored for 6 d and 9 d produced 159.6 and 101.9 eggs; significantly lower than the average fecundity of control females which was 214.8 eggs per female. [Conclusion]  Storing 3 d old pupae for 3-6 d at 10 ℃ is the best regime for low-temperature storage of this parasitoid.