Abstract: Correlation Sonar is usually used on the boat or the UUV for obtaining the velocity of vessel, current velocities and the depth of water. With the help of INS, it can help the vessel to locate its position and sail on the right direction. Correlation Sonar works on the principle of ‘waveform invariance’ and obtains the velocity of vessel by least-square fitting the theoretical correlation function and the data correlation function. In this paper, a new software control system is established on the platform of BF548. The new system has some communication modes, including TCP, UART, CAN. A file system based on FatFs R0.08b is built for storing data. The dynamic power system is used to reduce power consumption, which can help system to increase working time in using battery. The new system is introduced in the following aspects: system communication, data storage, power management and working process.