Abstract:The development of a scientific observing network in the western tropical Pacific Ocean is one of the key tasks of the Strategic Priority Research Program of the Chinese Academy of Sciences entitled "Western Pacific Ocean System". Ocean circulation systems in the region critically influence the evolution of the"Warm Pool", the El Niño/Southern Oscillation(ENSO) and the East Asian Monsoon, which have prominent impact on the global and regional climate. Fifteen subsurface moorings and the first batch of recorded data were successfully retrieved in 2015, demonstrating the initial establishment of China's scientific observing network. One-year high temporal and spatial resolution records of ocean temperature, salinity, and currents were obtained for the first time in this region. The unprecedented measurements in the intermediate and abyssal layers filled the gap in observing the deep ocean by the international community. Experience obtained from this work will tremendously benefit further development of the ocean observing network of China. New data will be provided for research of the deep blue and global climate, thus enhancing the capability in marine environment and climate prediction.