[1]departm ent of Medical psychology Shanghai General hospital Medical School of Shang Hai Jiaotong University Shanghai China;
[2]Children''''s Hospital of Eastern Ontario Ottawa Ontario Canada;
[3]Shanghai Jing''''an Education College Shanghai China;
[4]Shanghai Mental Health Center Medical School of Shang Hai Jiaotong University Shanghai China;
middle school students; Non-suicidal self-injury;