[Purposes] This study aims to establish the method of health monitoring to ensure the safety of long?span steel stadium in service stage. [Methods] Based on the serviceability limit state, bearing capacity limit state, and material yield strength, the warning threshold of the structural member strain is set. In addition, the warning threshold of deflection is set according to the requirements of serviceability and bearing performance determined in the specification. The warning threshold of wind pressure is set according to the return period of wind pressure. The structure is theoretically analyzed by combining with the finite element software, and the measuring point position is located. The stress, deflection, and wind pressure of the truss structure during the service stage are monitored in real?time by the structural health monitoring system, which is analyzed and compared with the theoretical value. [Findings] During the monitoring period, the stress, deflection, and wind pressure of the stadium truss structure are less than the first?class early warning thresholds and meet the design requirements. Thus, the structure is in normal working state. [Conclusions] The temperature stress has a great impact on space truss structure, which may have a local bad impact on the structure in extreme weather. The research methods and results can provide some reference for the health monitoring of similar projects.