Faults of the Wulungu Depression in northeastern Junggar Basin develop mainly in the peripheral and central depression，shown as NW—SE，NNW and EW direction thrust and strike slip faults on the plane，basement involved faults on seismic profiles. There are many types of the thrust nappe structure such as flat ramp, imbricated, duplex, divergent and convergent thrusts. Growth index of faults in this area reveals that the major faults and the fault system are with both horizontal and vertical migration law in their Mesozoic active intensity. Horizontally, the East is earlier than the West，its evolution is from east to west. Vertically, with time passed by，the main fault turn from the Hongpen fault to the Hongpen South fault and the Karasay fault. And the activity center migrated from NE to SW. The Northwest is weaker than the southeast on deformation，so the force comes from the Northeast and Southeast area.