Mixed deposits, which is composed of terrigenous fragment and carbonate of marine facies, develops extensively in the Lower Cambrian Balang Formation at Yangjiaping,Shimen,Hunan Province. Synthesized he previous studies, on the basis of studying the abundant outcrops and the data count to observe detailedly and interior data samples, carried out detailed research on the mixed deposits of the study area. In the study area, the macroscopic characteristics of mixed deposits are interbeded between terrigenous fragment and the mixed sediments , between carbonates and he mixed sediments, between different type mixed sediments in high frequency. The microcosmic characteristics of mixed deposits are showed the form of the mixed rocks ,which is composed of terrigenous fragment constituent and carbonate constituent of one layer. Mixed sedimentary type can be divided into complex mixed deposit Ⅱ and blended mixed deposit,which is often effected by the deposition.The complex mixed deposit Ⅱ is born of deposition of internal tide and turbidity current, the blended mixed deposit is born of deposition of deepwater in situ. The study area sendimentary was a deepwater slope environment, there were sedimentary tiny facies of internalwave and internaltide, sedimentary tiny facies of deepwater in situ and sedimentary tiny facies of turbidity current,etc; On the basis of the depositional environment , in virtue of the detailed analysis of the deposition characteristics of the internalwave and internaltide, the deposition mechanism could be analysed in detail; In virtue of the analyses the cause of the mixed sedimentation, deposition mechanism, location developing, deposition environment, etc, being guided by study of deposition principles, the mixed sedimentary model of the mixed deposits was established.