Abstract: Occupational hazard of confined space of deep mines comes from different sources.Due to the discrete data type，it is hard to realize the effective quantity analysis.The occupational hazards data of 173 deep operation platforms and chambers from 8 typical mines were analyzed.The key indexes of the occupational hazards were determined.5 different harm degrees were constructed based on the upper limit，lower limit of single index classification; The weight of each index was determined based on FAHP，and the risk evaluation matrix was built based on TOPSIS.The approaching degree between confined space of 20 deep mines and the ideal solution were calculated.The calculation results showed that the harm degree of the deep working platform is higher than that of deep chamber，and about 27% of the working platform lies at high harm level or more.Therefore the occupational safety protective measures for workers should be strengthened.The method provides a new way for pre-warning occupation hazards of confined space of deep mines.

Key words: Confined space of deep mines, Occupational hazards, Fuzzy Analytic Hierarchy Process, Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS)