Abstract: Compared with traditional solid web steel beams，the holes in the web of truss girders in the prefabricated steel structure of housing system enable the pipelines to pass through easily，which provides a higher room clear height and makes the structure economical and decorated． Experimental research and nonlinear finite element analysis of the steel truss girder were carried out． The ultimate bearing capacity and deformation characteristic of the steel truss girder were obtained． The failure zone mainly occurred at top chord near the loading point，and none of the web members reached the yield strain． When the girder was damaged，webs were at a relatively small force damaged after the chord，which could meet the design requirements of strong shear and weak bending． The big difference between yield load and ultimate load made the members have a large safety reserve． The finite element analysis results and the experiment results were verified each other，showing a better agreement．