Abstract：In order to study the radioactivity and radon concentration variation in coal mines,the radioactivity of coal was tested in the typical coal mines by using the radioactivity testing system,and the radon concentration was measured for different working procedure by using self-designed radon testing system,and the radon emission mechanism was analyzed during the tunnel excavation. The study results indicate that:( 1) the radioactivity of coal samples decrease as the increase of metamorphic degree,while for coal with different metamorphic degree,they show obvious difference in radionuclide content due to different ash content in them.( 2) the concentration of radon in working face ranges from 30 ~ 70 Bq /m~3,which belongs to low radioactivity level.( 3) excavation procedures including blast holes drilling and blasting can destroy the coal seam and result in the radon and gas concentration increase in working face. The investigation on relationship between coal failure and radon emission can provide a new method for coal and gas outburst prediction.

Keyword：radon measurement;radioactivity;dynamical disaster;mine excavation procedure;