Abstract: For the current roadway supporting problems including large deformation，serious failure of supporting components and bad supporting effect in Duerping Colliery，Xishan Coal and Power Corporation，it was found that irrational plate structure，bad conversion effect of pre-tight moment and insufficient bearing capacity were main influence factors.By optimizing current plate and its components，the bearing capacity of plate increased 92.5%when plate thickness reduced to be 10mm from 14mm，and pre-tight force increased about 70%under the same pre-tight moment.Underground test showed that supporting components’failure obviously reduced and supporting effect largely improved.