Dietary fiber plays a potential role in regulating energy intake and stabilizing postprandial blood glucose. As an important physical property of soluble dietary fiber， viscosity is also a key contributor to its nutritional effect. Nowadays， the nutritional effect of dietary fiber based on its physical properties has attracted researchers' attention， and viscosity's regulating effect on appetite has become an important entry point for the study of physical nutrition. The present article summarizes the health-promoting effects of dietary fiber's main physical and chemical properties， while the intervention effect and mechanism of dietary fiber viscosity-mediated appetite during eating was discussed systematically. The paper is believed to provide some ideas for the development and application of satiety-enhancing foods. Also， it is expected to lay a certain theoretical foundation for further in-depth and systematic exploration that reveals the health-promoting effects of dietary fiber.