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The WSN technology used in greenhouse facilities cannot get rid of the situation of human monitoring, so the WSAN technology was proposed to be applied in greenhouse facilities. A cooperative mechanism of actors in WSAN applied in greenhouse facilities was discussed, which consisted of a redeployment algorithm of actor (RDAA) and a real-time tasks assignment algorithm based on the sealed first price auction (RTAA-SFPA). The RDAA algorithm was used to deploy the actors in the middle of the event region to achieve real-time response of the occurred events. RTAA-SFPA algorithm was used to take the occurred events as the tasks being assigned by method of sealed first price auction. The simulation results showed that the cooperative mechanism proposed had better performance on the assignment and solution of the tasks through actors cooperation for greenhouse facilities.