Social awareness network (SAN) is becoming a new application normal form. To explore and evaluate the availability of the awareness, based on the traits of social awareness process in e-government IoT application, this paper extracts the hierarchical awareness structure by typical SAN. It focuses on analyzing the influence of sociality participation on awareness information. By synthesizing the functions of actors in the hierarchical structure of social awareness IoT and describing the node of SAN, it presents a hierarchical structure and availability evaluation modules for SAN. And the hierarchical social perception process is simulated and the idea of the model is verified graphically by computer software means. The results show that the model can express the comprehensive attributes of physical structure and social participation, and there is dynamic connection between nodes states and application requirements in SAN.