Abstract: The load-bearing characteristic, destructive procedure and the failure mode of the joint are investigated by joint shear test of wall panel which connected to the purlin, when the wall panel is carrying the dead load and the loads from the above wall panels .The dimension of the specimen is 1 000 mm 50 mm , the thickness of steel plate is 0.5 mm, and the total number of the specimen is 2.According to the test results, the first cause that leads to the failure of the wall panel joint is that, the self-threading screw is inclined when the force moment is created at the contact position , and the cap of screw is contacted with the wall panel in a certain angle , which leads to higher local pressure and makes the steel plate yielding.