Abstract: with the systematc lection on ight cal samples from a ypical borehole in Songhe Mline Field of West Guizhou with the mercury njection test and the permeabilit ratio data.the pore structure features and the pore volume fraction features of th coalresevoir under the development condiin of the mui seams were studied and the relationship between the pore structure paramneters and permeability was discovered The resuts showed that the average pecentage of the total pore volume with the micro pore,small pore,medum pore and large pore in the coalresevoir of the study zone were 30N%,36%,17%and 17% indidually the poreconfiguration was rational ,the pore connectvity of each pore d ameter section was good.thepore volume was 0.020 8 ~ 0.037 2 cmi3 g and the porosty was 3.35% ~5.16%.The verical developmert difrential of the pore parameters was high.No.1 seam and No.24 seam ad the pore condition for a single seam develogment There was d iference existed in the lowerlinit of the pore volume faction in ach seam and the fraction lower linit and test ell ermeatility ould be in utra ood negative crelation.The pore volume and the porosity had a certain positive correlation to the test well permeability.