These researches make the following results about principle`s applications of aqua running for athletic rehabilitation. Firstly, water treatment in principle`s application can be composed of ideal environment by Buoyancy, Drag force, Hydrostatic pressure, Specific heat and Temperature. Secondly, in Biomechanics of aqua running each general physiological reaction shows up working in the height of water level and the attitude of running inside of water. Thirdly, we can get higher intussusception rations of oxygen than running on the land through aqua running keeping proper, planimetries of maintenance of walking, combined exercises of interval of leg and arms attract rehabilitation for running on the land. fourthly, There are interactive relations between heart rate and oxygen-uptake, Rating of per-ceived exertion is made up of aqua running`s five steps of Brennan suale.