Abstract: In Biyang fault-depressed lacustrine basin, the tectonic settlement of basement presented a nonlinear or disconnected function and an anti-hinge type. Due to the joint effect of lacustrine level change and basement structural subsidence the accommodation change in steep slope zone of Biyang fault-depressed lacustrine basin only has three possibilities：1. decreasing at southern and northern rims but increasing in central zone; 2. invariant at southern rim but increasing in central and northern rim zones; 3. increasing at both southern and northern rims and central zone. In the light of the three cases, the sedimentation-response characteristics to the accommodation variation at different structural positions of the steep slope zone in fault-depressed lacustrine basin is analyzed respectively at different recharge rate of sediment-source. Taking Shuanghe-Zhaoao area in Biyang fault-depression as an example in this paper, accommodation mechanism to select reference well is discussed. Using well B207 as a reference well, the terrigenous sequences of the upper member of Eh2 are divided, and the isochronous stratigraphic framework model is set up.