Chengdu Airport Xingcheng Building Materials Co., Ltd. (hereinafter referred to as Xingcheng Building Materials Company) is a state-owned company designated by the district government, responsible for the acquisition, processing and sales management of sand and gravel resources within a certain range.

The management scope includes: (1) sand and gravel resources excavated underground but not limited to the red line of the construction project. (two) sand resources produced in river dredging, water conservancy construction projects and various pipe network construction. (three) the sand resources confiscated by the district law enforcement departments in the process of law enforcement.