The movement of ground fissures has brought great loss for Xi' an city building and industry production. Researching on the movement mechanism of Xi'an ground fissures has great significance for the prevention the disaster of ground fissures. Now most researchers believe that the extraordinary movement of the ground fissures mainly resulted from uneven ground subsidence that caused by the over pumping of ground water. However, there are different explains on the reason of the uneven ground subsidence. Here, the author uses the horizontal consolidation theory to explain the extraording movement of the ground fissures, according the compressing test results of horizontal and vertical, and the phenomena of movement of ground fissures and ground subsidence in Xi' an.