Abstract: In order to research the emission and distribution about gas in in the production process of fully mechanized top coal caving face in the gas outburst mine, taking the Mount Huangshan +735 coal mining face as engineering background, using the element method to measure in fully mechanized top coal caving face , collecting the data of distribution of gas , and the data collected are analyzed and studied, so got high gas mine approximate "company U+L" type ventilation in fully mechanized caving face under the gas, and along the vertical direction, coal mining face wall direction gas distribution, migration, provide certain reference to the coal mining and gas prevention occurrence in similarly conditions .

Key words: fully mechanized coal face, gas emission, gas distribution, "U+L", type