This study has one major purpose: to discover the formation of Dryden’s dramatic theory in the “Essay of Dramatic Poesy” published in 1668 through a detailed study of his seven earlier plays. The first chapter shows an elaborate consideration of the “Essay”. This provides the reasons that make the “Essay” important: as the first critical book review in English; as the first appreciative criticism of individuals; as a revolutionary change from the strict aesthetic rule towards the freedom of Romanticism. Furthermore, a brief summary of the “Essay” is also present. Chapter Two is devoted to the practice of Dryden’s dramatic theory on the unity of action. IT includes a short summary of the plot for each play, and also implicated some ...