Important problems concerning the design and application of the on-line analytical system are discussed, such as the selection of instruments, evaluation criteria, considerations about designing of sampling system, and the appropriate procedures for installation, calibration and practical operation. 对仪器选定的评估标准、取样系统设计和制作、在线分析系统安装和投运等问题作了讨论。此在线分析系统已成功投入运行。