This study aims to explore which psychological factors are profoundly stimulating imagination in the field of digital design and how these factors work during different design phases. We designed a questionnaire according to the five psychological factors of learning and investigated the students' opinions. In addition, we divided the design process into three phases: Pre-production, production, and post-production. The study's results indicated that being inspired by doing is the most profound factor that stimulates the imagination in the field of digital design. Next, the two factors of facilitative motivation and emotional sensibility influence the sparking of the imagination during the initial phase and with a lesser effect during the second and third phase. Finally, the self-efficacy factor profoundly influences the imagination's operation during the second phase. To sum up the results, we reveal that the five psychological factors explored have different effects on stimulating the imagination and on each design phase as well.