The modeling and simulation of intelligence，surveillance，reconnaissance(ISR) is difficult and important for joint campaign-level simulation. In the simulation, ISR model is required that it not only can accurately reflect the perception interaction between battle space entities, but also has a high running speed. To solve this problem, the modeling method of joint campaign-level ISR based on randomness theory was proposed. It took the modeling procedure of regional reconnaissance of aircraft image intelligence for example and described the main links of the modeling method. The modeling method was verified by the simulation experiment, and it showed the validity and applicability of the modeling method. Compared with traditional certain ISR modeling methods, it improves the efficiency of simulation on the condition of insuring simulation precision，and it also provides a reference method of C⁴ISR modeling and simulation in joint campaign-level warfare simulation.