Abstract: Since the Middle-Upper Jurassic in Sangequan-Mosuowan-Shamenzi belt in center of Junggar basin is almost missing, people had been thinking that it was a "paleo-uplift" caused by erosion. This paper argues that such an idea contradicts with the real conditions, for uplift shape and erosion or denudation are not found in available information, which is also in inconsistency to the sedimentary feature of overlying Cretaceous and the sedimentary facies in this area. In contrast, the correlation results based on drilling data indicate that in Middle and Late Jurassic there exists a high water-level stage or water-invaded stage during evolution process. And in the incomplete strata caused by insufficient filling not appear uplift and erosion, the "paleo-uplift" does not occur in the center of Junggar basin.

Key words: Junggar basin, Jurassic, paleo-uplift, deposit