Mrs. Dalloway is a novel full of sound, but there is scarcely systematic research on soundscape, especially the formation mechanism of soundscape, in the novel. Prof. Nie Zhenzhao' ethical literary criticism and theory of brain text can help to research on the formation mechanism and the aesthetic value of soundscape in Mrs. Dalloway. As keynote sound in the environment of the characters in the novel, the noise in London streets continuously disciplines people's subconscious and forms their brain concept that modern society featuring in modern transportation and commodity equals prosperity and blessing. The sound of Big Ben plays the role of the sound mark for everyone to arrange his or her activity and is in fact a powerful force to discipline people's brain concepts. Humans not only listen to sound, but also respond to sound. And such responses are the externalization of brain texts. Mrs. Dalloway's misinterpretation of the sound of the explosion of the tyre, Septimus' failure to hear the sound of the explosion of the tyre and that of the plane, as well as his extreme sensitivity to the sounds "kyar" "Kay" and "Arr" all play the role of mirrors reflecting the typical traumatic aftermath of the First World War in British people's mind and is the externalization of the brain text shaped by the sound of war. Characters in the novel also gradually clarify their affective commitment and make their ethical choice through their affection for and interpretation of sound. The process of Septimus' enjoyment of the sound in his daily domestic life is a process of clarifying his affective commitment; the process of Peter's and Rezia's interpreting the song of the old woman is also the process of clarifying their affective commitment and deciding on their ethical choice.
