Abstract：In order to take further research on the water productivity and connectivity of the Cambrian limestone and evaluate the feasibility of the dewatering exactly of the Cambrian limestone karst water in the 1st mine of Pingyu, 17 outlet holes of the 3rd mining area and 25 outlet holes of rehabilitated well yard were used to carry out of the three falls dewatering test of group holes.The result indicated that the water productivity and connectivity of Cambrian limestone aquifer is good, the rehabilitated well yard has significance on future dewatering.And the water level decreasing amplitudes of all observation wells were diminished instead of coming to steady state demonstrated the dewatering of Cambrian limestone karst water is feasible.The dewatering will still be the main method to prevent mine water disasters.

Keyword：Cambrian limestone water;dewatering test;the 1st mine of Pingyu;group holes;