用三个空间参数,即立体角系数、扇面角和配位矢量描述配位体在中心离子周围的空间堆积。统计160个以上镧系元素配合物的空间堆积,发现存在两个结构特征:立体角系数和有一稳定区间,(?)=0.78(堆积饱和规律);立体角系数矢量和(∑SAF·r)趋于零(堆积均匀规律)。后一规律用于模拟MA_3B 分子键角,结果与实验一致. Three spatial parameters, namely the solid angle coefficient, the fan angle and the coordination vector, are used to describe the space accumulation of the ligand around the central ion. The spatial stacking of more than 160 lanthanide complexes was statistically analyzed. Two structural features were found: solid angle coefficient and a stable interval (?) = 0.78 (stacking saturation law); solid angle coefficient vector sum (ΣSAF · r) Tends to zero (uniform packing law). The latter rule is used to simulate the bond angle of MA3B molecule, the result is consistent with the experiment.