In order to further enhance the ability of nuclear power plants to deal with beyond design basis external events similar to the Fukushima nuclear accident, most of the nuclear power countries require nuclear power plants to equip mobile equipment, including mobile power, mobile pumps, and necessary connections and support equipments. As an important mitigation measure under extreme conditions, in the background of frequent hazards and international tensions, mobile equipment configuration becomes a research focus in nuclear industry and supervision again. Domestic nuclear power plants are mainly based on engineering judgments to set the requirements for site regarding the configuration of mobile equipment, which is difficult to distinguish the differences between different unit types and the numbers of units. After years of research and practice, the United States has established a mature mobile equipment configuration method system, and the nuclear industry has formed a standardized practice in on-site and off-site mobile equipment configuration. This study investigated the requirements of mobile equipment configuration in the U.S., analyzed the configuration method and compared the differences in the practice of mobile equipment at home and abroad, and put forward suggestions for optimization of domestic mobile equipment configuration.