Abstract: The pipe truss, profiled steel sheet, PVC waterproof material and corresponding construction technology were used in the project of a large international convention and exhibition center.The project featured a large area of single roof, large working face, many joints, complicated site management and short construction period etc.As compared with the traditional roof, this roof had the following merits, such as close construction process, no request of technical interval, no wet operation and light roof load etc, which was very suitable for large span.After using and testing for more than a year the construction technology of the roof could fully meet the requirements of the actual use.