Sequence stratigraphic system is a stratigraphic system constructed in the chronostrati-graphic framework. The construction of this system depends on the depositional sequences with different ranks which are controlled by corresponding sea-level changes. Such a sequence strati-graphic system has been constructed for the first time in the Paleozoic strata in the northern part of the Tarim basin, which mainly depends on the study of outcrop sequence stratigraphy combined with the results of seismic stratigraphy and biostratigraphy. The system is composed of different ranks of sequences controlled by sea-level changes occurring in different periods, which enhances the precision of division and correlation of strata in the northern Tarim basin.