In recent years, the contemporary theory has examined the concept of double thinking, which is rooted in the theories of Saussure and Derrida's deconstruction. Helen Cixous, a French feminist writer, based on Lacan and Derrida, believes in the inversion of these oppositions in her theory of double oppositions. By communicating between women and writing, he seeks to subvert the patriarchal order. Jokha Al-Harithi's novel Sayyadat-ul-Qamar connects the rapid social changes and their consequences through an Omani family with the past and the real history of Oman. This novel depicts the story of three middle-class sisters in the small village of Al-Awafi in Oman in a patriarchal culture. The current research with a descriptive and analytical method aims to explain the changes in the cultural structure according to the approach of Helen Cixous in the theory of binary oppositions by combining tradition with modernity, changing gender role patterns, breaking taboos, social structure, attitudes towards education and romantic relationships. And by reading Sayyidat al-Qamar's novel, examine the way of drawing female characters and the challenge of patriarchal double thinking in Omani society. The findings of the research show that al-Harthi has tried to clear the gender roles in our minds and cross the gender boundaries in Sayyidat al-Qamar, and by inverting the Binary oppositions and creating a positive character, he has given a suitable image of today's woman.