Abstract: By the analysis of seismic data interpretation of Fuyu reservoir in Daqing Placanticline, the palaeotectonic maps of different times have been compiled. From the study of deformational characteristics of Fuyu reservoir, the structural framework has been found to be "a sag between two uplifts'' before the deposition of Qingshankou layer, and it has been changed into the structural framework of "a uplift between two sag" after reversion deformation of Mingshui formation. This indicates the structural framework before reversion deformation of Mingshui formation also determines the distribution of Fuyu reservoir formed in Nenjiang period.