The ore body in the northeast wing of Xinli mining area of Sanshandao Gold Mine is covered by sea water and Quaternary.At present,the area is mined to the level of-135 m.For safe mining,the roof protection pillar is reserved with a thickness of nearly 120 m,which occupies a large number of mineral resources.On the basis of safe mining,in order to recover the upper ore body resources as much as possible,the GD3Q-GA panoramic digital drilling TV camera system is used to drill holes in the upper roadway of 55 exploration line at -135 m level and -240 m level,and the development height of water persion cracks that may occur in the upper ore body is measured on site.The results show that the development height of surrounding rock fissures in the upper ore body of the northeast wing of Xinli mining area is about 30-40 m.If the mining continues upwards to -115 m level,there is still an upper ore body with a thickness of about 70 m above it,and the water-conducting fissure zone has not yet reached waterproof layer.On the other hand,all roadways at the -105 m level are watertight when they are full of water.The research conclusion is consistent with the actual situation.The reseach can not only provide technical support for the safe mining of the roof pillar in the northeast wing of the mine,but also is used as a reference for similar projects.