When traffic accidents are analyzed and recognized through the use of the multiple factors analysis method, the influence of uncertainty can be sorted and recognized. This method can better reveal the further reason of traffic accidents other than single statistical analysis methods. Rough sets can effectively analyze inaccuracies, inconsistent and incomplete data and discover underlying rules based on the data. This method has simple procedure of calculation and can find order of traffic accident causes, which are helpful in developing traffic safety policies. This paper introduces how to use rough sets for analyzing traffic accidents. Then the presented method is utilized to analyze the serious national traffic accidents data and western mountains traffic accidents data. The analysis results in drawing order of traffic accident reasons.
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