Scutellista caerulea Fonscolombe is an ectoparasitic enemy of Parasaissetia nigra Nietner, an important pest of rubber trees. This study aims to clarify the control efficiency of S. caerulea on P. nigra and provide data support for its further utilization. The functional response, searching efficiency and mutual interference of this parasitoid were measured indoors by dissecting to see if the wasp laid eggs under the host's abdomen at different temperatures and host developmental stages. There were 6 treatments for temperature, including 21, 24, 27, 30, 33, 36℃, and three treatments were used for the developmental stages of the hosts, early adult (1 to 2 d adult), brown adult (brown body color, 3 to 4 d before spawning), black adult (black body color, adults 1-2 days after laying eggs). The results showed that the functional response of S. caerulea to P. nigra matched the Holling-Ⅱ and Holling-Ⅲ models. In the range of 21-36℃, the control efficiency of S. caerulea on P. nigra was the maximum at 33℃, 44.4201 and the minimum at 21℃, 9.2458, and both models show that at 33℃, the upper limit of parasitism is the largest, which were 45.7 and 19.2, respectively. The control efficiency to the different development stages of P. nigra were:the largest in the black stage, followed by the brown adult, and the smallest in the early adult stage, which were 18.9044, 13.7410, and 7.200, respectively. And both models show that when P. nigra was black adult stage, the upper limit of parasitism was the largest, which were 15.7 and 12.2, respectively. Both models show that when P. nigra was early adult stage, the upper limit of parasitism was the lowest, which were 5.2 and 4.4. In addition, the Hassell-Varley interference model was used to fit the parasitic action rate of S. caerulea interfered by its own density under different temperatures, which indicated that S. caerulea had self-interference among individuals in the population when they parasitized. Temperature affected the search and self-interference of S. caerulea. In the range of 21-33℃, the search constant and interference constant reached their maximum values at 33℃, which were 0.6116 and 0.7535, respectively. In summary, when the developmental stage of P. nigra is the black adult, and the temperature is 33℃, S. caerulea has the stronger ability to control P. nigra, and the mutual interference is the strongest.