Objection Understanding of the change trend and influencing factors of incidence of sexual behaviors of Chinese college students in nearly 30 years

to ensure that the college students to establish correct sexual idea

sexual attitude

offer advice on safe sex.Methods This study conducted a cross-sectional historical meta-analysis of 167 studies on the occurrence of sexual behavior in universities from 1990 to 2018.Results The overall incidence of sexual behavior in universities had increased with the changes of times（from 8.88% to 17.80%

an increase of nearly two times）;There was a significant regression between age and sexual behavior

and the explanatory power was 47.8%.The incidence of sexual behavior of male was on the rise

while that of female female showed a trend of increasing

then decreasing and then increasing;The explanatory power of age on the incidence of sexual behavior of male students（71.2 %） was higher than that of female students（25.3 %）.The incidence of sexual behavior among students of different grades has been increasing with the change of time.The explanatory power for the occurrence rate of sexual behavior in universities in central China was 59.2%

with the most significant influence

and the explanatory power for the group of students in eastern China was 33.7 %

but there was no statistically significant influence on the occurrence rate of sexual behavior in universities in western China.