Abstract: To find out about the actuality and the changes of sexual behaviors, a self-designed questionnaire survey was conducted among 1085 students from 8 universities of Chengdu. And the results was compared with that of Pan Suiming' study in 1990 and 2000. it is found that cybersex is an important channel of sexual behavior. Attitudes toward same-sex sexual behaviors and the structure of core sexual behavior have all changed. The Proportion of masturbation and consciousness of sexual safety has improved. Universities should direct more of their efforts in sexual health education toward the following aspects: sex knowledge, sexual moral values, sexual safety, and network sex and same-sex sexual behavior.