A method and a device for selecting a detection area and an elasticity detection system. The method comprises: dividing organ tissue information to be recognized into a plurality of detection sub-areas, and calculating a feature value of the organ tissue information in the detection sub-area； determining an organ tissue boundary area according to the organ tissue information to be recognized； and determining an organ tissue boundary area according to the organ tissue boundary area and a preset feature value condition. The method can determine the organ tissue boundary according to the organ tissue information, and automatically adjust the detection area according to the organ tissue boundary.
