| Based on the things upwards, the article combine the work of geological hazard survey item"The Survey and Zoning of Geological Hazard in the Lintong county of Shannxi province"issued by the Ministry of Land and Resources P.R.C, using the disaster and territorial geological environment data investigated on the spot, and apply two methods of fuzzy synthesize assessment and grey clustering to the danger assessment of regional geological hazards, then discuss the rationality. The aim is to use the two methods of fuzzy synthesize assessment and grey clustering on analyzing the risk of geological disaster to satisfied the requirement of facility, practicality and rationality put forward by practice. The evaluation set has four-stage standard, that is to say the dangerous degree of the disaster is divided four stages. It selects four primary factors, including geological condition, topographical condition, climate and vegetation cover condition, and human condition. They include nines factors, which are characters, structure density, earthquake intensity, degree of slope, relative height difference, morphologic type, rainfall intensity, density of cover and human condition .Membership function adopts the echelon form one. By comparing and analyzing the two evaluation methods, it can be that they both can reflect the risk degree of Lintong county, and get almost the same assessment results. Because the types of indicators and evaluation indicator shave some difference, there is slight difference in discrete unit. On the whole, the assessment results coincide with the actual situation. According to the results Lintong county is divided into four region with different risk degree. Applying two methods of fuzzy synthesize assessment and grey clustering to the danger assessment of geological hazards in Lintong county,it gets satisfactory result.
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