Women are underrepresented in STEM (Sciences, Technology, Engineering and Math) fields in U.S. contexts. In this study, I investigate whether the prominence of the “follow your passion” ideology in choosing careers may be one factor that contributes to the gender discrepancy in STEM fields. Passion ideology is the idea that people choose their career mainly according to their idealistic personal interest. Previous research has shown that in terms of career preference, women tend to choose feminine stereotyped careers and are less interested in masculine stereotyped careers, and vice versa for men. STEM fields are masculine stereotyped. Therefore when U.S. society in general advocates for the priority of personal interest in career choice, we hypothesize that passion ideology mediates the relations between gender and interest in STEM fields, where women are less likely to develop interest in STEM. Considering passion ideology is less popular in Asian culture, in the current study, I primed Asian American women with either their American identity or Asian identity by using leading questions. Then I measured how interested participants are in engineering careers and art careers and how much participants agree that people should either follow their passions or be practical when choosing a career using a questionnaire. Following predictions are made: participants primed with American identity will be less interested in engineering careers than those primed with Asian identity, but not for art careers; participants primed with American identity will express stronger beliefs in the passion ideology than those primed with Asian identity; weaker interest in engineering careers when primed with their American identity will be mediated by stronger beliefs in the passion ideology. If these predictions stand, it suggests that, in U.S. context, these culture factors can partially explain the gender discrepancy in STEM fields.