In order to optimize the performance of MRO system and improve the operating efficiency of this system, two formation methods of BOM have been put forward. In addition, advantages and disadvantages of these two methods are pointed out. The storage means of BOM structure is extended from three layers to multi-layers, and Java language as well as Swing library are applied to go through and display this BOM structure. The practical application indicates that the BOM structure ergodicity and the display algorithm mentioned in this paper can effectively improve the operating efficiency of MRO system.