Aiming at the problem that WSNs is prone to different attacks due to his own features and traditional passive security mechanism can’t fully solve this problem

in order to improve the current security situation

design a new intrusion detection system（ IDS） model inspired in artificial immune system（ AIS）. It uses danger theory and improved dendritic cell algorithm（ DCA） applied in WSNs

which make nodes to execute different function and collaborate to identify intrusion

and strengthen robustness of WSNs. Simulation results shows that compared with self-nonself（ SNS） model

the new IDS model is better in detecting capacity and energy consumption.