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To draw lessons from historical chemical accidents and guide the practice of chemical safety production management，a method for identifying critical factors in chemical accidents based on text mining and improved DEMATEL method was proposed. Firstly，text mining technology was used to fully mine the text information of 1 627 chemical accident investigation reports，based on which 14 chemical accident influencing factors were extracted according to related literature，laws and regulations. Then，the fuzzy DEMATEL method based on alpha-level sets was used to calculate the performance levels of the factors affecting chemical accidents. Finally，the correlations between critical factors and other factors were analyzed and the mechanism of chemical accidents was revealed. The results show that 8 chemical accident influencing factors are identified as the critical factors，i.e.，extreme weather，regulations，technical procedures，hidden danger investigation，risk control，education and training，supervision and management，and operation management. These 8 critical factors have direct impact on the influence factors such as facilities and equipment，material reactions，occupational quality，job responsibilities，emergency management，and safety investment，which eventually lead to chemical accidents.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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