The control of low-frequency broadband excitation and acoustic radiation of ship thrusters is of great significance for the acoustic stealth performance of ship. The control of low-frequency broadband excitation and induced sound radiation in a combination thruster with a front stator was investigated in this paper. Starting from the theoretical prediction model of low-frequency broadband excitation for rotors, the influence of parameters such as flow field, geometry, and operating conditions on the broadband force of rotors was systematically calculated and analyzed. Three directions to control the broadband excitation of rotors were proposed: (1) improving the distribution of turbulent flow fields to make them as uniform as possible; (2) improving the geometric design of the rotor to reduce the pulsating load component;(3) improving the matching design of various components of the thruster and reducing the rotational speed at the same speed of ship. Based on several research achievements, control research was conducted on the low-frequency broadband force and sound radiation of the rotor of a combined thruster. It is concluded that the optimization of the hydrodynamic shape of the stern appendage and the optimization of rotor geometric parameters combined with the efficiency enhancement design of the duct and stator can control the low-frequency broadband force and sound radiation of the rotor to a certain degree, and that the optimization scheme reduces the peak and integral values of the low-frequency broadband noise of the rotor by about 3 dB. The research can provide certain reference for the control of low-frequency broadband force and induced sound radiation of ship thrusters.