陈念贻和温元凯根据原子光谱数据改进了Slater原子轨函的计算。他们从中定义了一个无量纲数失屏参数R_ξ,给出了43种元素的失屏参数和某些应用。但是对镧系元素仅给出La(Ⅲ)的失屏参数值。本文介绍一个计算镧系元素失屏参数的方法,并用这些参数讨论镧系元素性质递变规律。按陈-温改进Slater原子轨函的方法,失屏 Chen Nianyi and Wen Yuankai improved the calculation of Slater atomic orbitals based on atomic spectral data. They defined a dimensionless number of missing screen parameters R_ξ, given the loss of screen parameters of 43 elements and some applications. However, lanthanides only give the loss-of-screen parameters of La (III). This article presents a method for calculating the LST loss-of-screen parameters and uses these parameters to discuss the law of LST-type properties. By Chen - temperature method to improve Slater atomic orbit, the loss of screen