The deep-reflection seismic survey in INDEPTH IV project was designed to stretch across the Kekexili-balyanlkalla block and East Kunlun-Qaidam block, and can directly obtain a geophysical evidence for discovery of East Kunlun Orogeny’s geologic structure. Considering on dual-complex geological conditions on surface and subsurface, a seismic profile with high signal-noise-ratios has been obtained by means of first-break refraction residual statics, abnormal amplitude noise suppression and CRS stacking. The new interpreted profile presents that an ancient oceanic crust’s reflection responses discontinuously exist between the upper and lower crusts of lithosphere. The response represents one northward subduction of Songpan-Ganzi Ocean during the Triassic period and the discontinuity reveals that East Kunlun-Qaidam block’s south borders belong to a passive continental margin. Based on INDEPTH IV’s shot gathers, velocity and stacking profiles presently interpreted, a new uplifting model of east Kunlun Orogenic belt come forward to enhance much knowledge to intracontinental orogenic belt.