By the benefit comparison and test of two different coal mining methods,the primany full mining is better than caving mining and breaking top,whatever in the coal quality or economic benefit.

Analysis on coal mining rate of fully mechanized top coal caving mining in Kailuan Mining Area;

In order to study the overburden strata failure law and water conducted fracture zone development law under the condition of the fully mechanized top coal caving mining in Lu \'an Mining Area,three high level survey boreholes in the roof caving zone and the water conducted fracture zone were made in the 6206 fully mechanized top coal caving mining face in Wangzhuang Mine.

Research of coupled relation between fully mechanized coal caving mining and outburst;

Research on laws of observation of strata pressure in fully mechanized caving working face;

The fully mechanized caving mining technology for thick seam is not only favor to have a high production, high efficiency and high benefit from the thick seam mining, but from the practices, would have an obvious results to release gas disaster accident with special measures.

By release SF 6 tracer gas,inquired into air leakage regularity in level continuous actual miningoaf with fully mechanized sublevel caving methods,offered foundation for preven table coal spontaneoes combustion in mining distric