First of all, psychology research paper thesis should be organized like any other scientific thesis. The sections are: title, abstract, introduction, results, discussion, references and endnotes.
The title of your paper should tell to reader a lot about the content of your work, and it should be as short as possible.
Abstract is a brief summary of the entire work, usually it consists of one paragraph. Here you mention problem and method of solving it, results and your conclusions. The abstract should give the reader clear idea about your work. After reading your abstract, the reader will decide if your paper deserves his attention.
Introduction should introduce the reader to the problem and include questions you try to answer. It underlines theoretical or practical importance of the work. There are two ways to construct the introduction. In the first case you can state the problem and then mention what is written about it. The second variant is to review the history of the problem and then state the problem itself.
The introduction must lead to the statement of your chosen approach.
Results. Here you bring the summary of your work, explaining what you have actually found. It should not contain detailed statistics but some useful data to help readers understand the situation. All kinds of graphs, tables and charts are very effective in this section of the paper.
Then you come to discussion. You can bring the summary of results and return to the basic question of the work, comparing the results with your hypothesis.
References also must be organized in appropriate way, listing all the works used for your research.
Following these easy steps you will surely write successful psychology research paper thesis.