Abstract: Communication content, communication mode and timeliness of communication are the main three factors that influence the effectiveness of the communication between team members. Based on the work domain analysis to execution of state-oriented procedures (SOP), the assumptions for operation crews’ characteristics of the communication content in executing SOP were proposed, which supposed that the power plant status and parameters, power plant system functions and equipments, and SOP as well were the main communication contents. On a full-scope simulator of nuclear power plant, three operation crews performed experiments simulating accident scenarios. The results show that the assumptions of characteristics of the communication content are valid.