Simulation technology plays an important role in the research of the entire lifecycle of data link systems. The timesynchronization requirements of the Time Division Multiple Access (TDMA) data link system virtual real joint simulation system isfocused. Based on the idea of combining hardware clock synchronization with software clock synchronization, a timesynchronization scheme for the TDMA data link system virtual real joint simulation system was designed, providing a consistenttime foundation for all members of the virtual real joint simulation system. And a prototype system was built in the laboratory tovalidate the time synchronization scheme proposed in this paper. The experimental results showed that this scheme was effective andfeasible, and had advantages such as high accuracy and low cost.