【目的】 了解捕食性天敌烟盲蝽Nesidiocoris tenuis和寄生性天敌丽蚜小蜂Encarsia formosa的种间互作关系，优化2种天敌联合应用方式以提高对烟粉虱Bemisia tabaci的防控效果。【方法】 通过不同的天敌释放方式进行捕食观察和2种烟粉虱密度的种群试验，测定烟盲蝽对被丽蚜小蜂寄生后不同发育时间的烟粉虱若虫的捕食作用和偏好性，并评估烟盲蝽对丽蚜小蜂寄生率及控害效果的影响。【结果】 烟盲蝽可以且偏好捕食被丽蚜小蜂寄生后寄生蜂处于卵期和幼虫期的烟粉虱若虫，而随着丽蚜小蜂发育至蛹期，烟盲蝽对丽蚜小蜂寄生的烟粉虱若虫的取食率从85%急剧减少到11%。在2种烟粉虱种群密度下，采取同时释放以及间隔10 d先后释放丽蚜小蜂和烟盲蝽2种释放方式，烟盲蝽对丽蚜小蜂寄生率和控害效果影响较小；间隔3 d先后释放丽蚜小蜂和烟盲蝽，烟盲蝽会明显降低丽蚜小蜂的寄生率和控害效果。【结论】 烟盲蝽对丽蚜小蜂的捕食量会随后者的发育阶段而变化，在联合应用这2种天敌对烟粉虱进行防控时，应避免丽蚜小蜂释放后3 d释放烟盲蝽，有助于减少烟盲蝽对丽蚜小蜂的捕食，增强对烟粉虱的联合控害效果。

[Aim]  The aim of this study is to investigate the interspecific interactions between the predator Nesidiocoris tenuis and the parasitoid Encarsia formosa, with the goal to optimize the combined use of these two natural enemies in controlling the whitefly Bemisia tabaci. [Methods]  Through different release methods of natural enemies and two host density experimental design, tests were conducted to quantify the predation and preference of N. tenuis on unparasitized whitefly nymphs and parasitized whitefly nymphs at different developmental stages. Experimental populations were then observed to evaluate the effects of predation on the parasitism rate and control efficacy of E. formosa. [Results]  Compared with unparasitized whitefly nymphs, N. tenuis displayed a preference for predating parasitized whitefly nymphs when the parasitoids inside the hosts were at the egg and larval stages. However, the predation rate decreased significantly from 85% to 11% once the parasitoids reached the pupal stage. When comparing the two whitefly population densities, the parasitism rate and control efficacy of E. formosa was not significantly affected by N. tenuis when E. formosa and N. tenuis were released simultaneously or when E. formosa was released 10 d in advance. However, there was a significant decrease in the parasitism rate and control efficacy of E. formosa when E. formosa was released only 3 d before N. tenuis. [Conclusion]  The predation of N. tenuis on  E. formosa varies depending on the developmental stage of the parasitoid. When attempting to use E. formosa and N. tenuis in combination for whitefly control, it should be avoided the release of N. tenuis 3 d after E. formosa, to reduce the predation of N. tenuis on E. formosa, and in turn enhance their joint control efficacy on the whitefly.