The reheat-steam temperature of one 330 MW coal-fired power unit in Jiangsu had been lower than the design value for a long term. It not only affected the economy of the power unit, but also caused serious erosion to the last stage blades of the steam turbine. Through increasing the area of the low-temperature reheater in vertical position, the reheat steam temperature can achieve or even exceed the design level, which could bring huge economic benefits for the power unit. Moreover, the wear and tear problems associated with low-temperature reheater were also solved, which could significantly improve the safety and economy of the power unit.