Data link is the determining factor to realize interoperability for combat units. The implementation consistency of protocol among combat units is the basis of interoperability. According to the problems of ambiguity of message protocol expression and lack of generality of test model, the paper focuses on syntax and semantics test. We take messages and rules of Link-16 as test objects and construct consistency model based on modeling and simulation. Experiment results of JITC show that the method can conduct consistency testing of typical syntax and semantics and has good scalability.