Abstract This paper mainly introduces a simple and practical U-tube osmotic device. The device consists of U-tube and base. The bottom of U-tube is detachable, the semipermeable membrane can be fixed with silicone gasket inside, and then connected by grinding port connection. The whole set of device is easy to operate, has obtained the national utility model patent, and is transformed into a product, which is expected to become a common device for osmotic experiment teaching.
