A mathematical analysis for PLS main component was finished, and the ability of reducing dimension and noise filtration of this method was discussed.

对PLS的主矢量所张成的子空间进行了数学分析，并对该方法的降维去噪能力进行了讨论。

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Furthermore, we also provide a method for critical nodes selection based on modal analysis, which aims at reducing the huge dimension of injection space.

基于模态分析，提出了选择系统关键节点的方法，以实现注入空间的有效降维。

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But the reducing dimension phenomenon caused by this method is not fully solved.

但复合形法的减维现象是它的一大缺点。

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