Abstract：According to the characteristics of complex structures in Kongquehe area of Tarim basin，the paper presented a designing thought of gradually changed geometry:designing the acquisition parameters(maximum offset，group interval，geophone separation，folds etc.)point by point and segment by segment according to the trend of geologic structural variation and buried depth of targets,among which the NMO stretching,the accuracy of velocity analysis，separation of useful wave from interference，stable reflectivity and effective multiple suppression ete. are considered in selection of maximum offset，designed gradually-changed geometry can meet the needs of NMO stretching,accuracy of velocity analysis and reflectivity at the physical points with different layers.Different spread patterns are used for seismic lines in N-S and E-W directions separately. Acquired seismic single-shot records are characteristics of stable quality,high S/N ratio and reduced shallow multiple and refraction after using designed gradually-changed geometry,better solved the problems existed in data processing such as velocity analysis，NMO stretching, static corrections，stack and mieration imaeins and achieved good effects.
