Through comprehensive analysis of core observation and drilling，logging，and seismic data，and guided by highresolution sequence stratigraphy and theories of sedimentology，the sublacustrine fan sand bodies in the Middle Es3 in Minfeng area were finely characterized and studied by reconstructed wave impedance inversion. The results show that the deepwater sublacustrine fan deposits in Middle Es3 is mainly affected by the NE provenance system in Yong’an Town delta.Four sedimentary types of sand bodies are developed，i.e.，sliding-slump current，sandy debris current，turbidity current，and bottom current reworked sand bodies，and seven types of lithofacies are identified in the study area. On the plane，the sedimentary evolution of the sublacustrine fan are dominated by high-density sliding-slump current in the inner fan，sandy debris current in the middle fan，and turbidity current in the outer fan，which are differentially distributed on the strata with different relative paleoslopes. Further analysis shows that different lithofacies and their assemblages of the sand bodies are controlled by the multi-period base-level cycles，and most of them are developed at the top-bottom interfaces of short-and ultra-short-term cycles. Debris current tongues and turbidite lobes are developed well and they are mutually cut and superposed when the base level is in the descending semi-cycle（A/S falls）. On the contrary，they often are developed in isolation or in beads when the base level is in the ascending semi-cycle（A/S rises）；moreover，they are easily reformed by bottom current，forming small-scale vein-like or wave-like bedding，part of which can be cut and redeposited.