Due to the discrepancy of power between faculty members and students, student could not give informed consent to the faculty-to-student romantic relationship. The professor might abuse his power to favor the student in this relationship, which is unfair to the other students. Such relationship also brings negative effects to the normal study environment and the reputation of the university. The boundary between faculty-to-student romantic relationship and sexual harassment is indistinct and it is easy to turn the former relationship into sexual harassment. This study introduces how the American universities regulate such romantic relationship, explores the justification and necessity of such regulation in China and then suggests regulating approaches in China. Faculty members in a supervisory role should be banned to have romantic relationship with students. If the faculty member is not in such a position, then the faculty/student relationship should be strongly discouraged. Meanwhile, the university should clarify the scope of the regulation, the responsibility, precautions in advance and post-processing steps to deal with such situations.