Autonomous underwater robots have more outstanding benefits than research ships for benthonic detection. A key problem is how to better use the detection senor on the robot, such as the multi-beam sonar. However, the application method for multi-beam sonar on the underwater robot has not been introduced in detail until now. The techniques for the application of detection equipment are discussed and studied, and the main contents include interface, installation, acoustic synchronization, system error amending, and survey line design. The fine topographic maps were obtained from the multi-beam sonar on the robot. The trials show the validity of the proposed techniques.