Abstract: In order to accurately identify the hydraulic connection between goaf water and the water outlet point of active mine, the selected index factors include uncompacted ratio of the goaf, permeability coefficient of the rock formation in the water-conducting fracture zone, fault development degree, linear velocity of the goaf water, and the frequency of primary and secondary peaks of the iodide ion mass concentration. The entropy-weighted technique for order preference by similarity to an ideal solution (TOPSIS) model was used to quantitatively identify the hydraulic connection closeness between the Xiang'an Mine and the No.9 and No.11 mine in the Pingdingshan Coalfield. The results show that the quantized values of the hydraulic connection closeness of the goaf water between the auxiliary shaft of Xiang'an Mine and the water outlet point of 22091 airflow roadway, the water outlet point of the external opening of the 16150 conveyor roadway, the water outlet point of the 42 conveyor roadway, and the water outlet point of the -593 m drainage roadway were 0.81, 0.56, 0.35 and 0.01, respectively. Thus, the hydraulic connection closeness between these four places and auxiliary shaft of Xiang'an Mine is from strong to weak. The identification results are consistent with the change of water inflow at the four underground water outlet points after drainage of the Xiang'an Mine stopped, and the rationality of the index factors and the reliability of the model are verified. The research results can provide reference for the accurate identification of hydraulic connection closeness in similar mines.