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In order to study the influencing factors of the recombination circulation ventilation,the structure of recombination circulation under different wind speeds in the deep sunken open-pit mines,this paper qualitatively analyzed the recombination circulation ventilation through similar experiment and numerical simulation.Using the methods of dimension analysis and multivariate nonlinear regression analysis,the criterion equation for the decision parameter (K) of recombination circulation was obtained.The accuracy of the decision parameter was verified by grey correlation analysis.The results indicate three points:① The geometrical parameters such as the slope angle,depth and long axis of the open-pit mines are the main factors influencing the existence of the recombination circulation in the open-pit mines;② When the decision parameter of the recombination circulation ventilation ranges from 2.9 to 7.0,the recombination circulation ventilation will all be produced in the open-pit mines;③ Compared with the traditional decision parameter,it is more accurate for the decision parameter K with the slope angle to represent the recombination circulation ventilation.The result in this paper could further improve the ventilation theory of open-pit mines. [ABSTRACT FROM AUTHOR]