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With a rapid growth of interest in recent years, vague set has become an effective tool to handle inexact data in the fields of fuzzy information processing. In this paper, I use vague set theory on information analysis and decision support system, set up vague information analysis system, and develop fuzzy gray matter element space decision system into vague gray matter element decision system. Based on vague set theory, I set up an information and task incidence rectangular matrix, and make it as the base of information analysis and decision. The system especially suits for deciding expounding and estimating macroscopic complicated huge system.