This invention supplies a squareness double mode self-standardization sensor. Cross section of this sensor embody three-layer: outer layer is metallic conduit layer used for structure fixing and shielding effect; intermediate layer is insulant layer; inner layer structure is multi- pole attach at insulating layer; the poles dispersed over identity section to a certainty order, interval of neighbor pole is not equidistant. These inventions also supply two kinds of image reconstruction method base on this sensor. Aim at squareness measuring region, this double mode electricity imaging system sensor spread measuring range. The invention can measure object of different section and stimulation nonsynchronous, possess self-standardization property. The invention adopts multifold stimulation mode, realize synchronization and coordination measuring, make real part and imaginary part information of measuring sectional impedance distribution each other merge, and simplify the design and realization of soft and hard ware of bimodal measuring system.