With the development and application of all kinds of newest technologies, current weapon equipments are generally complicated integrative systems with mechanical, electrical and liquid su-systems. This makes maintenance training manner and methods be serious problem. So, half-practicality maintenance training system based on bus-mastering will be developed. Complete scheme and overall arrangement were designed based on research about functions of the maintenance training system. It deeply analyzed the need of hardware sub-system and software sub-system of the maintenance training system, on the basis of which one actual equipment system was reconstructed and hardware and software were designed. Reconstruction is mainly used to set faults. It provides guidance to developing half-practicality maintenance training system based on bus-mastering.