The key of “the Belt and Road” strategic vision is to strengthen road connectivity. The application of gaugechanging technology is the most effective method of strengthening connectivity in railway transportation. The structural principle of the foreign gaugechangeable locking mechanism was introduced, and the mechanism of gaugechanging technology in highspeed EMU bogie was analyzed. A locking mechanism of gaugechangeable wheel sets (applicable to 1 435/1 520 mm gauge) was designed. The intensity of the key part of locking mechanism was checked.