Cyclic steps are upstream migrating bedforms associated with slopes and cyclic hydraulic jumps broadly including chutes and pools. It can be roughly classified into netdepositional or neterosional one according to the predominance of aggradation at the stoss side or erosion at the lee side. Cyclic step is a longwave bedform with the aspect ratio of wavelength to height over 10.Specially, the formation of submarine (sublacustrine) cyclic step is strongly linked with slope gradient. The forming slope gradient usually varies from 0.25°~2°, while less would exceed 10°. Their associated deposits generally show asymmetrical lenticular or spoonshape in the longitudinal section, and they are usually characterized by the occurrence of structureless or coarsetail graded bedding and backset stratification. The supercritical turbidities and largescale, upstream migrating sediment waves are most representative ones. This bedform is widely distributed in most worldwide depositional environments, thus morphdynamics and sedimentological study is very meaningful for sourcetosink system as well as process and product.