Abstract: In order to ensure the mining safety under sea and to prevent sea water rushing into the mine, the paper had a study on the water flowing channel types for the coal mining under the sea, mainly including the structure cracking type water flowing channel, the mining dynamic water flowing cracking zone channel, the bore hole improperly sealing caused water flowing channel and the safety coal (rock) pillar failure caused water flowing channel in seam outcrop zone of sea area.Under the mining activities, the flowing water pressure and other factors, those potential water flowing channels would be the main accesses to cause the sea water rushing into t he mine.The paper analyzed the structure features and influence factors of the different water flowing channels and provided the relevant technical measures of the wat er prediction as well the water prevention and control.