The project, led by Prof. Yang Zijiang in ISEE, was supported as the key project by NSFC in 2015. To resolve the problem of ocean environmental sensing and signal processing, this project will studied distributed environmental sensing using underwater acoustic sensor networks (UASNs). The basic theory and the key technologies, such as underwater acoustic sensor networking, node localization, in-buoying signal processing, and so on, will be studied and its theoretical framework will be established. Through the theoretical calculation and analysis, simulations, and real sea test, the technologies to be developed will set milestones for the distributed acoustic sensing using UASNs.