Rotating liquid phenomenon to the intuition, vivid stimulate the students' interest in experiment, is a combination of ancient and modern In Germany, the United States and other university in some of the research physical experiments, for rotating liquid parabolic shapes of research is an extensive and important subject, is one of the physical learning techniques, geometrical optics, physical aspects of knowledge and rare optical experimental This experiment measured using modern laser technology of liquid surface shape rotating liquid through different rotating speed of liquid surface shape of liquid, can study more experimental Through measuring liquid surface height difference or through the laser beam axis parallel to the incident will gravity acceleration test slope method of measuring into height, speed, and so easy to measure the test variables, the value of the gravity The container with liquid cylindrical vessel YuanZhuMian around its uniform turns, the symmetric axis rotation liquid surface will become a parabolic, through the study of rotating liquid concave focal length and speed you can validate the relationship between When the beam in parallel axis rotation axis deviation in liquid, shoots the liquid surface reflection in level after left arrow on the screen, as also gradually move up the reflected light, screen left arrow into an increasingly small glowing, thus until the imaging research can be a parabolic liquid In liquid rotation system is stable, liquid resistance torque and suspension produced produced turn zhang silk, making the cylindrical objects moment balance to By formula deduction, will viscous coefficient into radius measurements and physical quantities such as more intuitive concise measured out liquid viscosity )