Abstract: In order to improve the dust control effect in the underground mine, based on the principle of micron grade water spray dust suppression technology, a d ust suppression equipment applied to the underground mine roadway was designed and applied to the underground mining and exaction faces in Liangbei Mine.With th e measurement of the dust contents before and after the dust suppression equipment applied to the air returning roadway of No.11141 working face and No. 11101 headi ng face in Liangbei Mine, the results showed that in the air returning roadway of No. 11141 working face, the dust collection rate of the micron grade water spray dust su ppression equipment reached to 74.3% and it was 34.2% higher than the dust suppression rate of dust conventional water spraying curtain.In No.11101 heading face, th e dust collection rate of the micron grade water spray dust suppression equipment reached to 84.2% and it was 41.2% higher than the conventional water spraying curt ain.The micron grade water spraying dust suppression technology would have a better dust collection effect than the conventional water spraying curtain and could effe ctively reduce the dust content in the underground mine.