By calculating the grey associative degree, the different disastrous conditions of natural disaster are compared and analyzed. 用计算自然灾害不同灾情的灰色关联度的方法，来对不同灾情进行比较分析。
With the characters of mine management conditions the fuzzy hierachical analysis model based on the grey relation degree is presented. 针对矿山经营状况评价的特点，在灰色关联度的基础上，建立了矿山经营状况的模糊层次评价模型。
