According to sedimentary facies and high-frequency cycles observation to outcrop and drilling cores, analysis to rock carbon isotope cycles, Gamma ray log ln(Th/K) time-series and seismic reflection characteristics, it’s studied to 6th, 5th and 4th order sequences (high-frequency cycles) and their stacked pattern developed in platform and outer ramp carbonates of Upper Ordovician LiangLiTaGe Fm. distributed in TaZhong-BaChu area, Tarim basin. The 6th order sequence (meters cycle), 5th order sequence (parasequence) and 4th order sequence (parasequence set) maybe separatedly related to Milankovitch cycles as 20~40 ka, 100 ka and 400 ka, and 11 to 12 parasequence sets as 400ka cycle has been identified in LiangLiTaGe Fm. in this area. It’s first advanced the carbon isotope of marine carbonate rock or fossil shell can be as the good index of relative eustatic sea level change and the carbon isotope – sedimentary cycle contrasting analyzing method to identify the chief controlling factor for formation of 3rd order sequence (eustatic sea level change, regional tectonic subsidence & uplifting). At the Early Katian stage as sedimentation of LiangLiTaGe Fm. in Upper Ordovician, the northern brim of TaZhong Platform behaved as shallowing upward aggradation stacking pattern, which mainly related to high steep rimmed platform margin formed from the controlling of TaZhong-I thrust fault movement; and the northwestern brim of BaChu Platform behaved as shallowing upward aggradation-progradation stacking pattern, which mainly related to ramp platform controlled by sedimentation as feeble faulting movement. The LiangLiTaGe Fm. distributed in TaZhong-BaChu Platform was able to form a 3rd order sequence, its chief controlling factor was the tectonic (subsidence-uplifting) movement of this Platform otherwise the eustatic sea level change, so it’s a typical regional tectonic sequence and no global correlation significance.