Abstract: With the continuous improvement of the mechanization level of underground mining in mines， more and more large-scale metal mines are inclined to adopt intensive mining mode for small and medium-sized scattered ore bodies in the mining area. However， for complex polymetallic deposits with variable ore body shapes and occurrences， the optimal stope structure parameters recommended by the intensive mining mode generally suffer from singleness and exclusivity. Based on the synergetic mining theory， this article takes the section size (width and height) of cross-section size of backstopping access for intensive mining of a complex polymetallic mine as the key parameter for detailed optimization research. For different ore bodies ranging from thin to medium thick， dip angle from gentle to steep， complex and diverse occurrences， and complex and diverse symbiosis of useful elements， the order degree model of synergetic mining system was established to calculate and compare the economic， safety and under the mutual influence of multiple technical indicators， the order parameter component order degree， subsystem order order degree and synergy degree of the three benchmark synergetic mining schemes 1，2，and 3 under the mutual influence of technology. Based on the above analysis， the synergy is compared and evaluated to obtain the degree of synergy of the sequence parameter components in the subsystem under the influence of multiple indicators. The results show that the recommended joint mining section size of 3 m × 4 m and 4 m × 3 m recommended by scheme 2 with the optimal mining degree， which is consistent with the prior order of the selected mining section size scheme， which is verified to a certain extent. The adaptability of the composite system coordination model to the intensive mining of complex polymetallic mines is provided， which provides a new idea for the optimization of the structural parameters of similar mines.

Key words: Synergetic optimization, Polymetallic mine, Intensive mining, Cross-section size of access, Synergy degree