For the procurement of business materials and consulting services of enterprises, in order to make the procurement process more scientific and standardized, it is suggested that centralized procurement should be carried out with reference to the industry recommended standards in the Sub-rules for Centralized Procurement of Enterprises in the Specification for Bidding Procurement Agents. The standard divides the scale of centralized procurement organization into three basic modes: batch centralized bidding procurement, centralized prequalification bidding procurement and agreement centralized bidding procurement, which can be applied to different types of procurement objects and actual situations.