The American depot-level maintenance ensures the American army’s leading role. Based on researches of defining the American depot-level maintenance ability, requirements assessing, work distributing and maintenance contract dealers supporting, introduce four suggestions: to enhance the awareness, giving more emphasis on depot-level maintenance building; to do further research on top reforming designs in depot-level maintenance, to do deeper work, accumulating the basic data about depot-level maintenance; to combine the routine work with the work at war, developing the ability to satisfy multiple-requirements.