The performance of network will directly influence the battle efficiency of the tactical data link system. Simulation and evaluation on the network system of Tactical Digital Link(TADIL) is of certain realistic meaning. This article builds a network model of Link-16 on OMNeT++，and finishes a layered realization according to the function of network nodes based on MiXiM．The influence of the system response time delay, end to end time delay and packets loss rate of every node on the unitary efficiency of network is analyzed in detail．It can provide certain reference for further research about military data link.