Abstract: To solve the problems existed in stratigraphic classification and correlation in Shimo area, the paper systematically studies the Mesozoic sporopollen fossils in Well Shimo-1. The sporopollen fossils can be divided into 195 species of 98 genera, and 5 sporopollen assemblages are identified, including the Concavissimisporites-Classopollis-Rugubivesiculites assemblage corresponding to the Lower Cretaceous Qingshuihe formation, Cyathidites-Cerebropollenites-Piceaepollenites assemblage corresponding to the Lower-Middle Jurassic Sangonghe formation, Osmundacidites-Cycadopites-Protoconiferus assemblage corresponding to the Lower Jurassic Badaowan formation, Dictyophyllidites-Aratrisporites-Alisporites assemblage corresponding to the Upper Triassic Baijiantan formation-the Lower Jurassic Badaowan formation, and Punctatisporites-Converrucosisporites xinjiangensis-Parataeniaesporites pseudostriatus assemblage corresponding to the Middle-Upper Triassic Karamay formation. The characteristics of the 5 sporopollen assemblages can be correlated with the assemblages in the Qingshuihe formation, Sangonghe formation, Badaowan formation, Huangshanjie formation and Haojiagou formation, and Karamay formation in the southern margin of Junggar basin, respectively. The data of the sporopollen fossils show that the strata of Jurassic are incompletely developed in the wellblock with the absences of Toutunhe formation, Qigu formation and Kalazha formation; the age of Sangonghe formation may be the late of Early Jurassic-the early of Middle Jurassic, the stratigraphic boundary between Middle Jurassic and Lower Jurassic should be located between the upper and lower member of Sangonghe formation; the age of the bottom of Badaowan formation may be the late Triassic, and the stratigraphic boundary between Triassic and Jurassic should be the lower Badaowan formation