Gangu Sub-branch of China Industrial and Commercial Bank. Gangu County belongs to Tianshui City, Gansu Province, which is located in the southeast of Gansu Province, the northwest of Tianshui City and the upper reaches of Weihe River. It is connected to Qin 'an County and Maiji District in the east, Qinzhou District and Lixian County in the south, Wushan County in the west and Tongwei County in the north. Therefore, the social security card in Tianshui rural area of Gansu belongs to Gangu Sub-branch of ICBC.