The theory of “hundreds of diseases resulting from qi disorder”clearly points out that the qi disorder is the important mechanism of disease. Spleen and stomach is the source of qi and blood and the pivot of rising and falling of qi,which closely related to the movement of qi. Gastralgia is common in diseases of spleen and stomach,in the treatment process it should pay attention to the regulation of qi movement. Chaiping Decoction has the effects of eliminating dampness and regulating the middle-warmer and qi movement,which shows significant efficacy in the treatment of gastralgia.