To improve the work efficiency of polling control model and distinguish network priorities, an Exhaustive-Threshold Two-stage Polling control model based on Site Status (ETTPSS) was proposed. Based on two levels of priority, parallel processing was used to only send information to busy sites according to busy and idle states of sites. The model could not only distinguish the priorities of transmission services but also avoid the queries to the idle sites without information packets, thereby improving model resource utilization and work efficiency. The method of probabilistic generating function and Markov chain was used to analyze the model theoretically, and the important performance parameters of the model were analyzed accurately. The simulation results show that the simulation values and the theoretical values are approximately equal, indicating that the theoretical analysis is correct and reasonable. Compared with normal polling model, the model performance is greatly improved.