The cargo bulkhead of two-phase stainless steel chemical tanker is made of two-phase stainless steel, which can directly contact the loaded chemicals. The inner cargo bulkhead does not need to perform the painting construction, but the outer cargo bulkhead as the bulkhead for other compartments such as ballast water tank needs to do. In principle, the stainless steel can not be given the surface treatment with the steel grit commonly used in factories. In order to avoid the pollution of stainless steel plate, it is necessary to select the brown corundum and other nonmetallic abrasives. During formulating the painting technology of ballast water tank in 38 000 DWT two-phase stainless steel chemical tanker, combined with the actual construction conditions of the shipyard and the construction cost, the ballast water tank is divided according to the material composition to give the surface treatment and perform the painting construction in terms of different conditions, which ensures the smooth development of ship construction.