Mental disorder has a great impact on students' learning adaptation and physiological development, but their identification, diagnosis, education, counseling and treatment are often neglected due to stigma and prejudice. This article introduces research data related to mental disorder, explain the new changes/definitions of mental diagnosis, and then introduce the latest development path of the Bronfenbrenner ecosystem theory, the PPCT model. At last, the researcher used observation method to design educational and guidance strategies to assist mental disorder students.