The invention belongs to the technical field of bogie systems and particularly relates to a gauge transformation method. The gauge transformation method comprises the following steps that (i) a bogieis supported, so that wheels are unloaded; (ii) sliding pieces are unlocked, so that the wheels are separated; and (iii) the wheels are slid to change rails. The purposes of the gauge transformation method are that aiming at the problem that when a train passes through railways with different gauges, the transport efficiency is low, the gauge transformation method is provided, based on the method,the wheels of the bogie can be adjusted in the axial direction relative to an axle, and thus the wheel distance of a wheel set of the bogie is transformed to adapt to the railways with the differentgauges. Railway transportation of 'Silk Road Economic Belt' is developed, thus the problem that the railway gauges are not uniform is faced, the situation that the variable-gauge bogie is provided forthe train is the most economical and efficient way to solve the problem of non-uniform railway gauge specifications, and therefore, quite important and profound significance is achieved on development of design of a variable-gauge bogie system.