As for mental health education, the significance of Three-Whole Education lies in the construction of a Four-level-and-Two-wing crisis intervention system, involving participants of the university, school, class, dormitory, as well as hospitals and the family. This paper deals mainly with a mental crisis of a university graduate, following the steps of case introduction, case analysis, counseling resolutions, counseling effect and reflections, and attempts to shed some light in practice on the effectiveness of this intervention system.