With the objective of understanding the seismic sequences, styles, evolution and control factors of Cambrian platform slope system in the Tahe oilfield, northern Tarim, this study discusses the origin of platform, forming environment of unconformities, and marine source rocks using high precision three dimensional (3D) seismic data of secondly acquisition and comprehensive interpretation of the conventional 3D seismic and drilling data. Sixteen seismic sequences have been identified in the Tahe oilfield. SQ6, SQ7 and SQ11 are developed with LST, and other sequences consist of TST and HST, characterized by asymmetrical cycles with quick transgression and slow regression. Cambrian carbonate platform in the Tahe oilfield generally presents a large progradational platform with features of longitudinal aggradation, eastward overlap and eastward migration of platform margins successively. The platform margin migrated more than 40 kilometers from west to east. Cambrian carbonate platform originated from the north slope of the Tazhong uplift, experiencing the evolution of ramp, flat topped shelf and rimmed shelf platform. Initial topography, relative sea level changes, extension activities, basement subsidences and paleoclimate played different control roles in different evolution stages, and paleoclimate and wind direction also played remarkable control role in the development of Middle Late Cambrian rimmed shelf.Regional unconformities were developed within the top surfaces between Xiaoerbulak Fm. and Cambrian, and also in the shelf edges of middle Cambrain Shayilik Fm. and Awatag Fm. in Middle Cambrian, respectively. All these unconformities formed in a tensional environment. The Cambrian marine hydrocarbon source rocks in the Tahe oilfield are well developed, especially with the Yuertus Formation distributed throughout the region, and the slope basin source rocks of Wusongger Fm., Awatag Fm. and Upper Cambrian are distributed in the eastern Tahe oilfield.