Abstract: Analyses are performed on a collapse accident occurred in the newly installed tubular demister in No.2 desulfurization tower of a thermal power plant, and optimization and transformation is made on the structure of the tubular demister, which effectively improves its structural safety and stability and eliminate the inherent potential risk points in the equipment design. Upon the upgrades, failures have been brought about no more, which offers reference for the transformation and optimization of the same type of systems.