Considering the weapon materiel maintenance condition, intelligence theory and method such as expert system and neural network is introduced in BIT technology. BIT intelligence maintenance decision in materiel maintenance field is discussed. The realization of materiel intelligence BIT reflects the concurrent design concept of system exploitation. Level integrated intelligence BIT system organization framework is adopted. BIT comprehensive decision-making and maintenance expert system structure is designed, and its implementation plan based on BIT is offered, which can enhance the fault diagnosis capability of modern complicated weapon materiel.