1, the founding time. Dagang No.3 Middle School, founded in 1998, is a key school applied for certification by the State Education Bureau, while Tanggu Ziyun School, founded in 2004, is an ordinary high school applied for certification by the State Education Bureau.

2. Educational resources. By July 22, 2022, there were more than 600 teachers in Dagang No.3 Middle School, and the educational resources of Tanggu Ziyun School were relatively weak.