It can be divided into three gradients. Official website, Education Bureau of Heping District, Tianjin, shows that according to the results of the first model of senior three in Heping District, senior high schools in Heping District can be divided into three gradients, the first gradient is No.1 Middle School and Hua Yao, the second gradient is No.20 Middle School, No.2 South School and private high schools, the second gradient is Zhong Yi and Jiacheng, and the third gradient is Shuangling, No.55 Middle School, No.21 Middle School and Jianhua. Tianjin is located in North China, northeast of North China Plain, downstream of Haihe River Basin, bordering Bohai Sea in the east, Yanshan Mountain in the north, Beijing in the west, and the rest are adjacent to Hebei Province. Tianjin has a warm temperate semi-humid monsoon climate with four distinct seasons.