Abstract:In the repair and construction of mani hall, the traditional construction oil decoration project is divided into three procedures: first step, cleaning the base level, cutting the Wooden base, removing the remaining old plaster. The second step is to re-make the plaster between the wood surface and the oil surface. Mani hall uses a layer of hemp thread and five layers of plaster. and the final step is oil paint over the surface. This paper records the whole process of oil operation and material proportion in repair and construction.