Why Women Kill is a popular American TV set released in 2019. Since it first appeared on CBS, it has received considerable attention from the public. There are three female characters, a perfect housewife--Beth Ann, a socialite--Simone Grove, and a legal elite--Taylor Harding, living in different ages, but all trapped in their own marriages. Although this TV set focuses on the meaning of marriage, characters' talking and behaviors can be analyzed from the perspective of Postmodern Feminism which is the development of Feminism and also an advanced form of it, thought Postmodern Feminism has its own weak points. This paper will talk about the three female characters from this perspective and conclude some enlightenment for the modern women and their marriages.