[Aim]  To determine the potential of Tamarixia radiata to act as a biological control for Diaphorina citri, a vector of Huanglongbing (HLB), and the potential for synergistic control in conjunction with Menochilus sexmaculata. [Methods]  The parasitic functional response of adult female T. radiata towards 4th and 5th instar nymphs of D. citri was measured under laboratory conditions. The effect of different densities of T. radiata on the parasitism rate was examined, along with the effect of temperature. Furthermore, the benefit of releasing just T. radiata to control D. citri, or releasing this species together with  M. sexmaculata, was assessed. [Results]  At 25 ℃, the parasitic function response of T. radiata to 4th and 5th instar nymphs followed the Holling Ⅱ type pattern, with the theoretical maximum daily number of prey being 55.55 and 90.91, respectively. The daily parasitism rate decreased significantly when T. radiata density increased in relation to both instars. An increase in temperature from 25 ℃ to 39 ℃ was followed by a significant decrease in the daily parasitism rate of D. citri nymphs (F_3,16=344, P<0.001; F_3,16=295.07, P<0.001). A temperature of 39 ℃ was lethal to T. radiata within 2 hours; no D. citri nymphs were parasitized at this temperature. Field enclosure experiments demonstrated that releasing both T. radiata and          M. sexmaculata so that the ratio of these and adult D. citri was 2∶1∶4, reduced the D. citri population by 93 .24% after 3 weeks. [Conclusion]  T. radiata is an effective parasite of 5th instar D. citri nymphs, but is less effectiveness against 4th instar nymphs. It also has low tolerance to high temperatures. Best results were achieved by releasing T. radiata in combination with M. sexmaculata so that the ratio of these species and adult D. citri was 2∶1∶4.