Rotary switch shower and its control method

A rotary switch shower, wherein it comprises:

• a handheld component, which is provided with a waterway, and the waterway is provided with a water outlet that is eccentrically arranged on a first counterface of a connecting end of the handheld component;
• and
• an outlet component, which comprises a essential body and at least two outlet terminals, and the essential body is provided with a plurality of independent cavities whose amount is equal to the outlet terminals' amount, and the outlet terminals are assembled on the essential body and communicate with the independent cavities respectively, and every independent cavity is provided with a water inlet that is arranged on a second counterface of the essential body, these said water inlets are assigned along the arc whose centre is at the rotation axis;
• the essential body can be rotatably assembled to the handheld component, the first counterface and the second counterface are hermetically grafted to each other, and switching of the waterways is achieved by rotating the handheld component, so that a water inlet is chosen to communicate with the water outlet, and then an independent cavity is chosen to communicate with the waterway, wherein
• a diameter-enlarged hole is arranged in the water outlet of the waterway of the handheld component,
• a leather cup is arranged in the diameter-enlarged hole in a sliding manner, and
• an elastic piece is arranged between the ring end of the diameter-enlarged hole and the leather cup.