Based on the Ocean of Things technology，a rapid networking mobile observing system is proposed to observe the mesoscale and microscale progresses and emergency events，and detect the suspicious targets in important sea areas. The observing system makes the mobile unmanned intelligent observing equipment as its main nodes，such as UAVs，USVs，wave gliders，underwater gliders，AUVs，drifting profiling floats and expendable devices. The observing system also takes the submersible buoys and seabed platforms as fixed-point observing equipment. The key technologies and development trends are discussed in this paper.
