海上平台的生产操作需要氮气源为平台设备提供覆盖气，吹扫气等。氮气瓶系统一般都适用于面积较小、设施简单的无人简易井口平台；而大型平台，尤其是综合性平台需要有专门的制氮系统来满足平台上的用气量。本文介绍了海上平台常用的膜制氮技术及氮气系统流程设计方案。“,”Nitrogen is needed on offshore oil and gas production platforms for purposes of blanketing, purging, etc. Nitrogen bottles are normally used for normally no manned wellhead platforms with small area and simple equipments; For large platforms, special nitrogen generation system is needed to satisfy the large nitrogen user consumption. This paper introduces membrane type nitrogen generation method which are usually adopted on offshore platforms and the design guide for nitrogen system.