Hydrographic survey is essential and widely welcomed in the world for economy, security and society purposes. However, how to survey in a safer and faster way is always the question to the modern world. USV, short for Unmanned Surface Vehicle, is a revolutionary platform that can carry all kinds of the sensor for hydrographic survey. In this paper, two specified applications of USV are shared and discussed. To learn more about the available products, solutions, and services for the channel survey, please visit Hi-Target Marine and Hydrographic solution.