In charpter4, we study the uniqueness of meromorphic functions concerning sharing values, and obtain some results, which improve and generalize the related results due to Fang, Zhang-Lin and so on.

• 在第四章，我们研究了亚纯函数关于分担值的唯一性问题，得到几个结果，推广并改进了方明亮，张晓玉-林伟川等人的有关结果。