The long span truss system with corrugated steel chords was developed. Several full scale tests and numerical analysis were conducted, and the behavior of the structure was studied. The imperfect composite behavior of truss elements, buckling of the stiffener at the connector, instability of vertical member, and other structural problems were solved by complementary details. A reasonable design method was proposed considering out-of-plane deformation of the corrugated steel sheets, slip at the bolt connections, and geometric initial imperfection. The corrugated steel plate, as a structural element and exterior material, gives more economic design.