Abstract: Objective To preliminarily explore the applicability of the diagnostic and statistical manual 5th edition（DSM-5） level 1 cross-cutting symptom measure-adult in military cadets,understand their mental health,so as to provide basis for developing the work on psychological hygiene. Methods In April 2019,the DSM-5 level 1 cross-cutting symptom measure-adult,self-reporting inventory（SCL-90）,patient health questionaire-9 items（PHQ-9）,generalized anxiety disorder（GAD-7） and general situation questionnaire were used to evaluate and analyze the mental health status of 940 military cadets in a base. Results Totally 929 valid questionnaires were collected. The average age was （20.4±1.6）years old and 925（99.6%） were male. The score of DSM-5 level 1 cross-cutting symptom measure-adult was （4.62±6.49）points,the score of SCL-90 was （102.10±19.80）points,the score of PHQ-9 was （2.60±3.14）points,and the score of GAD-7 was （1.34±2.40）points. The depression score was （0.49±0.66） points,anger score was （0.40±0.65）points,and suicidal ideation score was （0.02±0.16）points on the DSM-5 level 1 cross-cutting symptom measure-adult.The mental health of cadets with oral ulcer and gastrointestinal symptoms were worse than that of asymptomatic cadets（all P<0.01）. The statistics of five items in the sub-scale of psychotic symptoms and substance use of the DSM-5 level 1 cross-cutting symptom measure-adultwere not ideal（n'≥4）,and the correlations between the scores of the other 18 items and the total score of the scale were all significant（r=0.430-0.755,all P<0.01）,showing good item homogeneity. The scale internal consistency reliability was estimated with a Cronbach's α coefficient of 0.890,Spearman-Brown split reliability coefficient was 0.869,and the correlation coefficient with the SCL-90 total score validity was 0.787（P<0.01）. The correlation coefficients（high value） between DSM-5 sub-scales（except psychotic symptoms and substance use） and SCL-90 sub-scales were r=0.444-0.668（all P<0.01）. Conclusions The applicability of DSM-5 level 1 cross-cutting symptom measure-adultin military cadets is feasible except the dimensions of psychotic symptoms and substance use. The reliability and criterion related validity of the scale are good. The mental health of the cadets is generally good,but the problems of depression and anger still deserved special attention. The psychological service should be carried out according to the distribution characteristics of mental health of cadets.

Key words: Military cadet, DSM-5 level 1 cross-cutting symptom measure-adult, SCL-90, Mental health