在大基壳模型的基础上系统地研究了Ｌｉ同位素核的结构性质．０ω计算可以很好地再现６，７Ｌｉ的结构，而对远离核８，９　Ｌｉ的某些态必须考虑（０＋２）ω激发，其计算结果才能很好地与实验符合．对滴线核，扩大模型空间或改变相互作用后的计算仍不能再现１１Ｌｉ核的奇异性质．简单讨论了６－８Ｌｉ某些态的奇异性质． Based on the large basement shell model, the structural properties of the Li isotope nucleus have been studied systematically. The calculation of 0ω can reproduce the structure of 6,7Li well, and for some states far away from the nuclei 8,9 Li, the excitation of (0 + 2) ω must be considered and the calculation result can be in good agreement with the experiment. Calculation of drip line kernel, expanding model space or changing interaction still can not reproduce singularity of 11Li core. The singular properties of certain states of 6-8Li are briefly discussed.