Abstract: 151 molecular structures of uranyl compounds are treated in calculating the ligand packing around the equatorial plane of the uranyl ion. It is determined that the average fan angle sums are all close to 180° even with structures of different coordination number. Coordination saturation is thus proved to be space saturation in the uranyl equatorial plane.Fan angle parameters of ordinary ligands are derived in the treatment. For compound UO2AmBnGp steric packing around uranyl ion could be estimated by the following equation:FAS= mFAA +nFAB + pFAc.Various packing diagrams are suggested to estimate the compound stabilities and to construct the synergistic extraction systems.