Transpressional deformation is the main style in intracontinental deformation，and is the basic pattern in the process of mountain building. BogdaHarlik Mountains are located in eastern Tienshan(in the middle of TurpanHami Basin and Junggar Basin). It is an ideal field laboratory to study the Cenozoic Mountain building. A variety of orogenic mechanisms were proposed by scholars，but contradictions still exist. Through our geological mapping，remote sensing interpretation and digital topographic analysis，two groups of strikeslip faults(NWW and NEE respectively)are closely related to the Cenozoic uplift of BogdaHarlic Mountains. The BogdaHarlik Mountains should be considered as a typical transpressional orogeny. The upliftrelated deformation are NEE 70° and NWW 290°，and thrust fold to the direction of the basins developed on both sides of the mountains，which indicates the nearly northsouth stress field； Secondly，the age of fluvial sands from Tianchi River are concentrated at 428 Ma(628％)， 188 Ma(290％)and 32 Ma(82％)，which reveals that the drainage terrains have experienced 3 different cooling phases. The map of fissiontrack age shows the samples with old age mainly distribute in the margin of the mountain，and the youngest in the centre area of the mountain. Based on the similar tectonic background，the transpressional orogeny mode can be also used in the interpretation of Cenozoic rapid uplift of the entire Tienshan.