The kidney is the human body and the spleen is the foundation of qi-flowing. Therefore, as the source of restoring vitality, invigorating qi should regulate the spleen and kidney. Professor Zhao Fen has a unique understanding of the treatment of spleen and kidney, and uses straight chain to replenish the spleen. The clinical application of Shuang Sheng Spleen-kidney Fuyun Decoction, Slow Kidney Decoction and Ziling Formula fully embodies the experience of treating spleen and kidney together.