Method for preparing a beverage from a capsule and device therefor

The is from the preparation method of drinks or liquid food; the bag is provided with a product according surface is withdrawn, wherein the bag is provided with a flexible diaphragm (17), the diaphragm can prevent elastic or the permanent elastically to a pipette the intervals; the method comprises the following steps: Piercing pieces multiple holes (26); and hole is distributed on the flexible diaphragm, injected of a groove of the water the flexible diaphragm, namely the diaphragm distorts of the product direction of the bottom layer, and; the water through the hole penetrates through the bag. Is pierced the size of the hole tip piercing pieces of a bag filled layer or for the control of product of the bag, thus affects of the flexible diaphragm two sides (17a, 17b) and a liquid power pressure difference Δ P, it comprises of the groove product the pressure of the automatic control.