Abstract: Multiple reflections are highly prevalent in marine seismic data, severely affecting seismic imaging and limiting exploration and production efficiency. Therefore, methods for multiple suppression have become particularly important. With the emergence of ocean bottom node (OBN) seismic technology, the up-down wavefield deconvolution method for the surface-related multiple elimination (SRME) has gradually progressed from theory to practical application. Up-down wavefield deconvolution utilizes the relationship between the upgoing and downgoing waves recorded by seabed receivers. Under the assumption of horizontally layered media, it achieves attenuation of free-surface-related multiples through deconvolution.This study focuses on the application of up-down wavefield deconvolution to OBN data from the P area. By combining it with other multiple attenuation techniques to further suppress residual multiples, significant multiple removal effects have been achieved. The seismic data imaging quality has been notably improved, laying a solid data foundation for reserve growth and production expansion of oil and gas fields in the P area.