Abstract: The 2nd phase construction of Gaocun Iron Mine was started in 2005，and now the annual stripping volume has exceeded 10 million t.With the expansion and downward extension of the pit，the slope wall exposure area has increased yearly.The enclosing circle area above +30 m has complex terrain and seriously weathered rock，leading to instability of the pit slope.The pit blast-caused seism has an increasingly more serious impact on the slope and the near-pit buildings.In order to reduce the negative influence of the blast seism，nearly ten pieces of measures such as interval charge, cinder cleaning blasting, delay blasting, have been taken to reduce the blast-cause vibration based on the theoretic analysis，domestic and foreign experiences and continuous summary and exploration. In the combination of the present status, the method for vibration reduciton on its future improvement are described.

Key words: Open-pit mine, Blast seism, Non-electric millisecond delay blasting, Measures for vibration reduction