Jiayuguan Construction Bank. As a national commercial bank, China Construction Bank has many customers in Jiayuguan City, and its Longxitang bank card belongs to Jiayuguan Construction Bank. Jiayuguan is a prefecture-level city in Gansu Province, an important node city in Gansu section of the Silk Road Economic Belt, a sub-central city in Gansu Province, and an important metallurgical and advanced manufacturing base in China.