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In order to discover the airflow pattern in mine shaft which Outfitted with hoist equipment(HE),this paper set up the physical model and anatomized the piston-wind caused by hoist equipment,and researched the flow field and velocity field around the hoist equipment during its moving process,and analyzed the airflow around single and couple hoist equipment as well as decisive range of piston effect and additional effect of hoist equipment to ventilation system.Research conclusion indicate that during hoist equipment movement,airflow pattern changes repeatedly because of the influence of pis-ton effect from hoist equipment,and the study of airflow stability jn shaft is the foundation for the stability of ventilation in mine.