Investors' decisions affect the allocation of resources in the capital market so it is important to gain knowledge about the mechanism and factors affecting their judgment and decision-making. In the first step, this study, provides an integrated picture of the theories and viwpoints related to the application of cognitive psychology in the field of judgment and decision-making. In the second step of the research, the thematic analysis has been used to investigate the factors affecting the quality of investors' judgment and decision-making from 2006 to 2022 using 40 papers published in international journals. Analysis results related to the factors affecting the quality of investors’ judgment and decision-making show five main themes, including; (1) The usage of qualitative (narrative) information in addition to quantitative information to convey information, (2) Historical course of theories related to judgment and decision-making, (3) Effective factors making differences in the quality of judgment and decision-making, (4) Impact of implicit and integrated feelings and emotions on judgment and decision-making, and (5) Consequences (benefits of paying attention to the factors affecting the quality of judgment and decision-making). The results of this study show that decision and judgment of investors can be affected by the interaction of factors affecting the person, the type of activity (goal) and the environment, and it is necessary to pay attention to each of these factors in order to explain the behavior and judgments of investors.