With the development of simulation technology, simulation test has become an important way of assessment and evaluation of weapon equipment. But it is the development need for the enhancement of test credibility to reflect the uncertainties in battlefield environment. By studying the characteristics of the uncertainty of combat activities, this paper puts forward the relationship between the certainty and uncertainty of the combat simulation test, establishes the intelligent simulation framework of complex testing system and its main elements, and analyzes the way to realize the combat uncertainty during simulation testing. It provides a basis for construction of combat simulation test system.