You can't. According to the Education Bureau of Saihan District, official website, fresh graduates of primary schools who have primary school status in Saihan District and are actually attending schools have household registration in Saihan District, while fresh graduates of primary schools who study outside the four districts in the city can study in Saihan District. Therefore, if the child's household registration is in Saihan District and the primary school is in Yuquan District, junior high school can't go to Saihan District.