Theory of conversational implicature is mainly used to analyze common conversations. Anyhow， when it comes to interpret poems， it will also bring perfect effect. As a famous poem of LI Bai， Sitting alone in Face of Mount Jingting has brought us aesthetic feeling， but we need to speculate what the implicature of the poem and what the purpose of the poet. To interpret Sitting alone in Face of Mount Jingting from the perspective of conversational implicature may give us a better understanding of it.