In this paper the cause of formation of environmental disaster in the western Guizhou is analyzed, it is influenced by natural factor and human activities.

本文分析了贵州西部环境灾害的形成原因，它既受自然因素的影响，也受人类活动的影响。

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It can be used to analyse the natural disaster of single hazard factor.

二级模型适用于单一致灾因子的分析。

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