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In wireless sensor network one of the most security threat is the reactive jammer because of the mass destruction to the sensor communication and it is difficult to disclose. So we have to deactivate the reactive jammers by identifying all the trigger nodes, because the transmission invokes the jammer. Such a trigger identification procedure can work as an application-layer service and benefit many existing reactive jamming defending schemes. In this paper, on the one hand, we leverage several optimization problems to provide a complete trigger-identification service framework for unreliable wireless sensor networks. On the other hand, we provide an improved algorithm with regard to two sophisticated jamming models, in order to enhance its robustness for various network scenarios. theoretical analysis and simulation results are included to validate the performance of this framework.