One year. According to the inquiry of Rongcheng Education official website, the division of school districts changes every year. All localities need to scientifically define the service area of each compulsory education school according to the overall enrollment goal of the school and the students' enrollment nearby, and according to the number of school-age students, school distribution, school size, traffic conditions and other factors in the county, so as to ensure the full coverage of the compulsory education enrollment policy.