Based on the composition of “Satcom on the Move” satellite communication device，high precision satellite tracking technology and antenna control technology are introduced. The process of software realization for “Satcom on the Move” satellite communication device is proposed，and then the specific design is introduced. The software of “Satcom on the Move” includes monitor & control process software，display & control process software and servo control process software. Monitor & control process mainly completes the tracking algorithm，and the software system adopts the vxWorks real-time operating system as a platform to ensure high real-time performance during the track；display & control process software employs graphical icons control(NI control) technology to display the system status and fault information in real-time；and servo & control process software controls the antenna angles to ensure real-time response. Open-loop control algorithm for tracking and double close-loop correction are used to ensure the communication of the system on a mobile platform，and the high reliable communication of “Satcom on the Move”is realized.