It belongs to modified tetrasulfonic acid oba, and its surface whitening ability is higher than that of ordinary tetrasulfonic acid oba and slightly lower than that of hexasulfonic acid oba. It has very superior performance price ratio for medium white pure white cultural paper with CIE requirements lower than 160; High purity and low by-products; The combination ability with fiber is general. It is suitable for whitening in surface sizing and coating. The reuse rate of oba is higher than that of hexasulfonate when cutting edge dry loss paper is reused.