The invention relates to application of an elastic conductor in the technical field of measurement rulers, the property that the impedance changes in the deformation process of the elastic conductor is used, and the to-be-measured length value is obtained through detecting the elastic impedance. Besides, the invention provides an electronic measurement ruler which comprises the elastic conductor,a connector and a controller; the controller is formed by an impedance measurement unit, a control unit, a power supply unit, a display terminal and an operation terminal; two ends of the elastic conductor are connected with the connector, and an electric loop is formed under the power supply situation; under the action of the control unit, the impedance measurement unit measures the impedance ofthe elastic conductor and displays the impedance on the display terminal. The electronic measurement ruler is simple in structure, because the elastic conductor can perform of deformation such as multiple times of stretching, reversing and folding, length measurement of irregular objects can be realized, the electronic measurement ruler has the advantages that the range is large, the accuracy is high, the ruler is portable, intelligent and not easy to damage, and the electronic measurement ruler has a good application prospect in the electronic measurement ruler aspect.