Some Lower Triassic ichnofossils are first discovered in Chishui area, the southern part of Sichuan Basin. These fossils are attributed to 4 ichnogeneras and 8 ichnospecies, including 3 ichnospecies indeterminated, in Jialingjiang Formation, namely Palaeophycus tubularis, Palaeophycus curvatus, Palaeophycusisp.A, Palaeophycus isp.B, Planolites octichnus, Helminithopsis abeli, Helminithopsis isp, Phycodes pedum. All of these ichnofossils chiefly are invertebrate fodinichnia and agrichnia, in which the majority is preserved as hyporelief, the next as epirelief and the minority as full relief. According to the characteristics of ichnofacies assemblages, combined with the analysis of sedimentary facies, these fossils can be divided into two ichnoassemblags: (1) Palaeophycus ichnoassemblage, representing the depositional environment of limestone flat during shallow water effected by short term change of sea level. (2) Planolites-Helminithopsis ichnoassemblage, representing the depositional environment of inner depression within open sea platform with lower energy during deeper water than that of the Palaeophycus ichnoassemblage.