The invention provides a strain gauge which includes a fabric base and at least one conductive yarn. In addition, the fabric base is weaved with a plurality of non-conductive yarns, and the fabric base thereon defines a sensing direction. Moreover, each of the conductive yarn is gimped by a textile process with one of the non-conductive yarns and is woven through the fabric base along the sensing direction. Furthermore, the at least one conductive yarn is capable of being applied by an electric power; when an external force acts on the fabric base, the geometrical property of the at least one conductive yarn alters so that a change of an electric property associated with the applied electric power is sensed to indicate an elongation of said strain gauge applied by the external force along the sensing direction.