In order to prevent traffic accidents form “passive processing” to “active prevention”, we build a multi-index and hierarchical road traffic safety evaluation index system. In the system, we take the human-vehicle- road-environment as the first level index, and those significant influence factors among them as the second level index. The weight is determined by analytical hierarchy process(AHP) -Entropy method, and the comprehensive level of road traffic safety level is evaluated by the extension cloud model. The example based on a city in Shandong province proves the model can correctly evaluates the road safety level. Keywords: traffic safety, situation analysis, extension cloud model, AHP-Entropy method

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