采购（procurement /Purchasing /Purchase）：是指企业在一定的条件下从供应市场获取产品或服务作为企业资源， 以保证企业生产及经营活动正常开展的一项企业经营活动。

常见的采购形式分为战略采购（Sourcing）、日常采购（Procurement）、采购外包（Purchasing Out-services)三种形式。

购买（purchase/buy）：是指用钱交换购买者所需的需求、物品或者非实体商品。购买是拿钱换东西，与“卖”(sell)相对。

总结二者的区别：

购买往往表示具体的行为。采购强调指个人或单位在一定的条件下从【供应市场】获取产品或服务作为自己的资源，为满足自身需要或保证生产、经营活动正常开展的一项【经营活动】。

参考双语例句：

The Secretary-General’s previous proposals on the ERP implementation strategy (A/62/510/Rev.1, paras. 40–45) suggested that the ERP project would be designed, built, tested and deployed in two waves: the first to be completed over a 30-month period by the end of 2010, for the core finance, human resources, procurement and asset management functions required for compliance with the International Public Sector Accounting Standards (IPSAS); and a second wave over a 24-month period for design-build-test-deployment of the remaining functions, such as results-based management, risk management, transportation and travel.

秘书长先前关于企业资源规划系统实施战略的提案 (A/62/510/Rev.1，第 40 至 45 段)建议，企业资源规划项目的设计、建立、测试和部署将分两波进行：第一波为期30个月，于2010 年底完成，建立遵守《国际公共部门会计准则》(《公共部门会计准则》)所需 要的财务、人力资源、采购和资 产管理等核心功能；第二波为期24个月，主要是成果管理制、风险管理、运输和差旅等其余功能的设计-建立-测试-部署。

Looking ahead, the Director-General is confident that the changes put in place (such as the clarification of the Manual items and their relation to the Financial Regulations, and appropriate training) will enable the Secretariat to function within clear and well-known procurement rules, and will lead to a better understanding of and strict adherence to such rules by the Secretariat, in order to prevent reoccurrence of the failures identified in the audit report.

展望今后，总干事满怀信心：已实施的变革（如明确手册条款及其与财务条例的关 系，以及相应的培训等）将使秘书处能根据明确和明白 的 采购 条 例 行事，也将使秘书处更好 地理解和更严格地执行这样的条例，以防止重犯审计报告中指出的错误。