Abstract: Sequence development and evolution are determined by relative lake level(accommodation) change and sediment delivery in rift-subsidence lake basin.When relative lake level rises,wave energy increases,lake water prograds toward source area,lake-transgression beach and bar and slumped turbidite increases and lake-transgression fan-delta is formed.When relative lake level dropps,wave energy decreases,fluvial energy increases,lake-regression fan-delta ias formed,sandstone and conglomerate of distributary river course develop,and beach and bar of HST and flood turbidite are formed.Because that hydrodynamic force energy of sedimentary environment in different stages of sequence evolution is different,distribution of sandstone and conglomerate is different.