Clastic rock-carbonate mixed sediment is widespread in various depositional environment, however, because of the restriction of the different deposition conditions and a rather later start research, the degree of the clastic rock-carbonate mixed deposits study is relatively weak. Clastic rock-carbonate mixed deposits are very developed in Lower Paleozoic in Helan Mountain and lack of systematic investigation so far. Narrowly speaking, mixed deposition of the Early Paleozoic in study area is peperite which contains argillaceous limestone, marl, calcirudyte and limy siltstone. Broadly speaking, mixed deposits of the Early Paleozoic in study area are mainly mixed product series which include inter-bedded clastic beds and carbonate beds, diamictite beds and clastic beds, mixed sedimentary beds and carbonate beds. The paper discusses the mixed deposition characteristic from 4 aspects as follows: Sedimentary phase transformation, regional stratigraphic contact relationship, residual strata distribution and detrital material source. The Cambrian and Ordovician showed different mixed depositional character: The Cambrian shows the "collage" mixed sediment pattern, while the Ordovician shows the gradual mixed sediment pattern. Plate movements, changes of sea level and the supply of terrigenous materials together controlled the mixed sedimentation of Early Paleozoic of study area. The basin type of the Early Paleozoic of study area experienced such an evolutionary process: The coexistence of oceanic and cratonic basin in the Cambrian, confined cratonic basin in the Early Ordovician and foreland basin in the Late Ordovician.