Abstract: Objective To understand the trend and influencing factors of myopia in children and adolescents in Liunan District of Liuzhou City,provide reference for formulating prevention and control measures. Methods A stratified cluster sampling method was used to select students from nine schools in Liunan District of Liuzhou City from 2018 to 2021. The far vision examination,refraction test and questionnaire survey were performed,and the data were analyzed. Results From 2018 to 2021,the myopia rates of children and adolescents in Liunan District of Liuzhou City were 57.86%,56.88%,56.44% and 55.94%,respectively,showing a downward trend in general,and the difference was statistically significant（χ²_trend=9.678,P<0.05）. The myopia rates of girls were higher than those of boys,and the differences were statistically significant（all P<0.05）. The multivariate logistic regression analysis showed that changing seats regularly（OR=1.136,P<0.05）,adjusting the height of desks and chairs according to students' height（OR=1.083,P<0.05）,doing eye exercises at school（OR=1.042,P<0.01）,taking breaks outdoors during recess（OR=1.902,P<0.01）,and parents limit children's time of watching TV,playing computer or video games（OR=0.828,P<0.05） were protective factors for myopia. The long time for homework/reading and writing after school（OR=1.139,P<0.01）,near work for long time before resting（OR=0.893,P<0.01）,reading books or electronic screens when walking or taking a bus（OR=0.788,P<0.01）,turning off the lights when looking at electronic screens after dark（OR=0.881,P<0.05）,and lying or prostrating to read books or electronic screens（OR=0.828,P<0.05） were risk factors for myopia. Conclusions From 2018 to 2021,the myopia rate of children and adolescents in Liunan District of Liuzhou City is decline year by year,but it is still at a high level. It is necessary to develop myopia prevention and control measures from individuals,families and schools according to the influencing factors of myopia,to reduce the risk of myopia among children and adolescents.

Key words: Myopia rate, Children, Adolescents, Influence factors