With the rise of behavioral finance, psychological theories have entered the field of finance, opening up new horizons for traditional financial viewpoints. This study explores the investment behavior of police officers from the perspective of behavioral finance, and uses the five personality traits proposed by McCrae and Costa (1985) to test them. However, to understand the investment behavior of police officers, we must first understand their behavior patterns. Therefore, this study adopts the subjective norms and perceptual behavior control proposed by the theory of planned behavior to detect the investment behavior of police officers.