Objective: To investigate the prevalence of myopia and its related factors in primary and secondary school students in Luzhou

China

and to provide a basis for strengthening the prevention and control of myopia in these students. Methods: A cross-sectional study was conducted in June to October 2018

and a total of 3 143 primary and secondary school students in the four counties and three districts of Luzhou were selected for examination of visual acuity and questionnaire survey. The obtained data were subjected to one-way analysis of variance. Results: The overall prevalence of myopia was 51.1%; the prevalence of myopia was 47.5% in boys and 54.5% in girls;the prevalence of myopia was 40.3% in primary schools

60.8% in junior high schools

and 85.4% in senior high schools

with a significant difference between them（P < 0.05）. The highest risk factors for myopia included at least one parent with myopia

daily use of eyes at close range for more than 5 hours

weekly use of electronic devices for more than 5 hours

and weekly tutoring or remedial classes for more than 5 hours（P < 0.05）. The results of multivariate regression analysis showed that at least one parent with myopia

daily use of eyes at close range for more than 5 hours

and occasionally or often reading in bed were independent risk factors for myopia. Conclusion: The prevalence rate of myopia in primary and secondary school students in Luzhou was as high as 51.1%. It indicates that the government

schools

hospitals

and parents should all pay attention to strengthen the control of risk factors for myopia

so as to improve the visual status of primary and secondary school students in Luzhou.