In And Then There were None, the lack of detective role makes the character dialogue weaken from the two-way nature of "Detective - Suspect" and become a multi-angle network dialogue between "suspect-suspect". Without a detective role, how can the readers act as detectives themselves to find clues in the reasonable rhetoric of everyone? Some do research from the perspective of psychology. In Psychology and Literature(2014), Carl Gustav Jung once mentioned that psychology can be used to study human psychological activities, and can also be used to study the creation and development of literary works, because human psychology is the foundation on which all science and art are based. Men, Shiyao and Zhao, Qing(2018) research the stream of consciousness literary language. The stream of consciousness literary language breaks the law of traditional expressions, and uses complex associations, reversed time series, and inner monologues to present complex psychological changes. The writer uses these three expression techniques to describe the protagonist's psychological change process in a large part, and to add his own thought flow to the novel characters, and to use the expression of the stream of consciousness in a prominent way, so that the novel is deeply rooted in the hearts of the people. Some researchers probe the languagearts from character languages in And Then There were None. Huang, Wei（2015）analyses that the author abandons the common "something thought", "someone thinks" such a prompt, and directly presents the reader's five inner monologues. There are a lot of information in the ”stream of consciousness” of five different characters, which have the embodiment of different characters. More importantly, the psychological activities here suggest the development of the storyline. This method of psychological activity to enrich the plot is fully utilized by Christie, adding a different color to her detective novels.