The main outcome of this paper include the followings: First of all, a structural health monitoring (SHM) system consisting of various sensors (including the GPS et al.) is being implemented to the Guangzhou New TV Tower (GNTVT). Secondly, making use of an output-only modal identification algorithm (Frequency Domain Decomposition-FDD), the first ten modal parameters of GNTVT are identified using the measured acceleration responses acquired during the typhoon periods. Finally, the structural responses and dynamic characteristics during the typhoons are presented by using figures, tables and finite element model. The results of this paper have dual meanings of theory innovation and practice instruction.