The anti-rust treatment of space frame components depends on the environment around the project. In general environment, we suggest adopting the sand blast or ball blast to Sa 2.5 grade firstly, and painting secondly（the paint type also depends on the environment）. The power plants and chemical plants are all high corrosive environment so it is proposed to use the treatment of galvanization or zinc spray. In order to protect the galvanized layer during the transportation, it should be painted one layer of finish on the galvanization layer. C-type purlin can not be easily painted, so it is proposed to use the galvanized C-type steel, then it is not necessary to paint.