Tunnel thrusters are mainly installed on the bow and stern of the ship. It is also divided into two types: fixed pitch propeller and variable pitch propeller. The variable pitch propeller mainly uses the hydraulic system to change the pitch to change the power. The fixed propeller mainly uses the frequency converter to change the speed of the motor to change the power. Ships running on international routes are generally required to install side thrusters at the bow, mainly for the convenience and safety of crossing the canal. But it is mostly used on tugboats, such as those running oil platforms, lifesaving ships, and so on. Next, I will introduce the application of the side thruster on the ship running on the oil platform: when the ship is close to the oil platform, the main propeller generally has no thrust or only a little thrust. At this time, the side thruster is mainly used to realize the lateral movement of the ship. Slowly approach the platform. Generally, ships like this are equipped with more than 2 high-power side thrusters to realize the lateral movement of the entire ship. In most cases, the platform does not allow the ship to be moored on it, so the requirements for side thrusters are very high.