Abstract: The 10₂ seam is 2.0m under the gob of 9 seam in Caozhuang coal mine. The roof support for the roadway of 10₂ seam is not bolt but the steel beam sets because the roof strata of 102 seam are much broken due to 9 seam mined out. In order to speed the advance rate and lower the support cost, roof truss-bolt system test has been made in 10804 haulage roadway and achieved gratifying success.