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In order to better use microwave antireflection technology to safely and efficiently extract coal seam gas，and to explore the influence of coal moisture content change on the antireflection effect under cyclic microwave conditions，firstly，the transverse relaxation time (T2) spectrum and longitudinal relaxation time (T1) -T2 spectrum characterizing the pore structure characteristics of coal samples were obtained by NMR technology. Then，the characteristic parameters of nuclear magnetic resonance were obtained by using T2 data，and the change of pore structure evolution with water content under cyclic microwave radiation was further clarified. Finally，based on the mechanism of cyclic microwave permeability enhancement，the pore structure evolution mechanism of different water-bearing coal bodies was revealed. The results show that the pore structure of coal with different water saturation is obviously improved under cyclic microwave radiation，and the coal sample with 75% water saturation has a better antireflection effect than other test coal samples. In the process of cyclic microwave radiation promoting the evolution of pores to larger pores，pore blockage occurs due to the thermal fracture of coal，and increasing water saturation can reduce this phenomenon. The cyclic microwave anti-reflection mainly relies on thermal stress and air pressure. With the improvement of coal permeability，the effect of microwave anti-reflection is weakened，and the influence of coal water content is weakened.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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