1. 研究目的与意义（文献综述包含参考文献）

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.

2. 研究的基本内容、问题解决措施及方案

Major research methods will include documents research, and deduction. 1)Documents research. A document research is the process of reading，analyzing，evaluating and summarizing scholarly materials about a specific work. The author of the thesis has looked up in many libraries some background information, including the psychology theory, Agatha Christie's classic work. Agatha Christie 's biographies,and previous studies on And Then There were None. In the meantime, the academic database and online materials are used as the references of the study. Deduction. This method refers to the drawing of a conclusion by reasoning. In the main body of the thesis, every conclusion will be followed by well-grounded reasoning. For example, the thesis will come to the conclusion that psychological description of characters in And Then There were None hinted at the development of the storyline. In order to support this view, the study will make a detailed analysis of the psychology of each main character.