Currently, the environmental protection department and power generation companies pay more and more attentions to the anticorrosion problems on wet-method desulfurization chimney. Under this background, this paper discussed the construction scheme of chimney inner pad anticorrosion project for Guangxi Heshan Power Plant, as well as the construction methods for the key positions, such as the construction joints, the tube wall split bolt holes, the embedded reinforced head roots, the construction connection joints with new-old pouring material, the pouring material surface and so on. These practical and reliable construction methods that focus on details can be the reference for the similar projects.