The urgency and necessity of ocean observation network construction in Guangzhou are expounded and the significances of ocean observation network construction in marine disaster prevention and mitigation, coastal engineering construction and marine aquaculture are analyzed and illustrated. The status and results of the ocean observation network construction in Guangzhou are summarized and the existing observed data are used to analyze the hydrometeorological characteristics of the sea area of Guangzhou during the periods of typhoon ^“Hato^” and ^“Pakhar^” and the characteristics of tidal saltwater intrusion during the dry seasons from 2015 to 2017. The research results have revealed that the existing observed data can obviously reflect both typhoon and salty tide activities and have a great significance in marine disaster prevention and mitigation. For using the existing observed data more efficiently and maximizing the value of the observed data, problems in the aspects of observation mechanisms and business workflow, data quality control, rationality of the layout of observation stations and data application analysis are discussed and the measures of optimization and Improvement and the direction of future development of the ocean observation network construction in Guangzhou are put forward.