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To address the issues of ambiguous multi-level，multi-link and multi-functional interaction relationships and the adverse coupling effects during operations in confined spaces，FRAM was introduced. Combined with ISM and AHP，the hierarchical structure and judgment methods were optimized and improved. By dividing the risk hierarchical structure，the impact of system function coupling variability was quantified，and the importance of functional units and hierarchical structures was calculated. Through the results of functional variability and coupling loss degree，the input-output phenotype of upstream and downstream functional changes were determined，and the coupling mechanism among system functional elements was clarified. The results show that by applying the risk prevention and control model for operations in confined spaces based on the improved ISM-FRAM-AHP，23 functional units and a 10-layer risk hierarchical functional network are obtained. The maximum values of functional variability and coupling loss degree are 4.36 (external environment F23) and 0.808 4 (formulating operation plans F2)，indicating a relatively high operation safety risk degree. The functional changes are mainly manifested in sequence，goal and control. Four effective functional barrier measures，physical，symbolic，functional and invisible，are proposed for 8 failure links.
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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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