Abstract：In order to reveal the structure of mechanism of gas desorption in tectonic coal,a coal sample test device had been designed for testing the gas desorption capacities and velocity of western Henan Province tectonic coal with different structural characteristics. Experimental results show that the gas desorption capacities and velocity in tectonic coal with laminated structure is larger and faster than in tectonic coal with granular texture; the gas desorption capacities of former in 0 ~ 1 min,0 ~ 3 min,0 ~ 5 min and 0 ~ 60 min are respectively 3. 51 ~ 3. 70 times,3. 11 ~ 3. 46 times,2. 80 ~ 3. 16 times,3. 05 ~ 3. 46 times as big as the gas deception capacities of latter; the gas desorption velocity of former in tenth seconds and sixtieth seconds are respectively 3. 72 ~ 3. 92 times and 3. 78 ~ 4. 29 times as faster as the gas desorption velocity of former. Barrell type can calculate the lost content of gas desorption in tectonic coal with granular texture. When the lost content of gas desorption in tectonic coal with laminated structure is calculated by the Barrell type,there is large error.

Keyword：laminated structure;granular texture;tectonic coal;gas desorption;