Lorenz water wheel is a model to describe the chaotic system. The movement equations are analyzed

and a Lorenz water wheel is set up. The video analysis software tracker is used to trace the motion of the water wheel

recorded by a mobile phone. The corresponding physical images，such as phase diagrams，are drawed quickly and

easily. Both the chaotic attractor and the initial value sensitivity have been found. Then the system has been proved

to be a chaotic system by analyzing several experimental images.