Abstract: The southern fault zone in Biyang depression is a difficult area for seismic survey due to its complex seismic -geologic conditions. The quality of previous seismic data is low due to the limitations of technical conditions, and cannot meet the requirements of geologic study and solve the complex geologic problems in this area. Through improving shooting conditions and the quality of single shot and designing scientific and rational observation systems with forward modeling technology, the signal - to - noise ratio and resolution are remarkably improved and seismic data are acquired in the whole southern steep slop zone. They can meet the requirements of structural interpreta-tioa