1, Huai'an secondary examination 3 plus 4 schools are: construction engineering school in Huai'an City, Jiangsu Province, Xuyi Institute of Technicians, Huai'an City Secondary Specialized School, Huai'an City Hongze District Technical School, Jiangsu Joint Vocational and Technical College, and Huai'an Bioengineering Branch College.
2. Huai'an City, abbreviated as "Huai" and known as "Huaiyin" and "Qingjiangpu" in ancient times, is a prefecture-level city under the jurisdiction of Jiangsu Province and a large city of type II. Located in the north-central part of Jiangsu Province, the eastern part of the Jianghuai Plain, located in the Yangtze River Delta region, is an important center city in northern Jiangsu Province, the northern part of the Yangtze River Delta, the modern center city, a member of the Nanjing Metropolitan Area, the Huaihe River Ecological Economic Zone, the first mention of the first city, a third-tier city, located in the intersection of the ancient Huaihe River and the Beijing-Hangzhou Grand Canal, in the north-south demarcation line of China, with China's fourth-largest freshwater lake, Hongze Lake.