The gauge requirement for vehicle as very strict. With different measurement method, the air-spring height was different, which had big influences to the bogie height measurement result, and maybe result in misunderstanding and wrong judgments. During the bogie height adjustment process, a proper height measurement test method was important to ensure that the bogie design height and actual height was consistent. The paper described the stress softening properties of the rubber parts, and studied how the measurement method effected the height measurement results with examples, put forward several suggestions