流体的分析与可视化是可视化的中心问题。近几年基于拓扑的方法引起了越来越多的兴趣，本文描述一种流体封闭流线的探测方法。-fluid analysis and visualization is visualization of the central issue. In recent years, based on topological methods attracted more and more interest, the paper describes a closed fluid flow line detection method.