Abstract: Objective To understand the status and influencing factors of sexual knowledge,sexual concept,sexual psychology among military personnel stationed in a certain department of Tibet,so as to provide reference for further sexual health education and intervention of sexual psychology. Methods The self-made and unregistered questionnaire was used to investigate the current situation of 260 officers and soldiers stationed in a certain department of Tibet in May 2020. Results 20.8% of military personnel held that "spermatorrhea can hurt their vitality",5.8% of them believed that "moderate masturbation is still harmful",and about 50.0% of them did not know the correct contraceptive methods. There were statistically significant differences in the sexual knowledge among military personnel with different demographic characteristics. The mastery of sexual knowledge in military personnel who are only child was higher than those of non only child,the mastery of sexual knowledge in military personnel from urban area was higher than that in those from rural area,the mastery of sexual knowledge in married personnel was higher than that in unmarried personnel,the mastery of sexual knowledge in Han nationality personnel was higher than that in those of ethnic minorities,and the mastery of sexual knowledge in military personnel with high school education or above was higher than that in those with junior high school education（χ²=4.396,5.900,18.189,6.806,7.157,all P<0.05）. The sexual concept of military personnel stationed in a certain department of Tibet had its particularity,among which 48.9% maintained that "sex can take place as long as resonance between two lovers",43.5% argued that "premarital sex will be tried if there is an opportunity to serve",and 51.2% believed that "sex and marriage are two different things". 11.2% agreed that "I like to change girl（boy） friends frequently" and 14.7% agreed that "I can have multiple sexual partners at the same time". In terms of sexual psychology,60.0% of military personnel stationed in a certain department of Tibet had a strong desire to communicate with the opposite sex,but 55.4% of them held that they lacked the skills to communicate with the opposite sex of the same age. 3.5% of them liked to see the same sex naked,and 13.8% of them didn't like their own gender. There were 18.1% of the military personnel stationed in Tibet who often doubt that their sexual function has problems,and 10.0% of them who often doubt that their reproductive function has problems. As far as the answer of "I lack communication skills with the opposite sex of the same age" is concerned,the military personnel stationed in Tibet with Han nationality were more than those with minority nationality,the military personnel stationed in Tibet from urban region were more than those from rural region,and the difference was statistically significant（χ²=5.402,17.770,both P<0.05）. The military personnel stationed in Tibet of different education level had a great difference in this answer,but the difference was not statistically significant（χ²=3.603,P>0.05）. There were no statistically significant differences in the answers of "I often doubt that I have sexual function problems" and "I often doubt that I have reproductive function problems" among military personnel stationed in Tibet with different demographic characteristics（P>0.05）. Conclusions There are some problems in sexual knowledge,sexual concept and sexual psychology of military personnel stationed in a certain department of Tibet. It is necessary to strengthen sexual knowledge education and counseling of sexual psychological problems,strengthen gender communication,psychological counseling of marriage and love,and shape correct concept,to ensure ideological stability of officers and soldiers and the smooth completion of defense tasks.

Key words: Military personnel stationed in Tibet, Sexual knowledge, Sexual concept, Sexual psychology