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Drew lesson from the synthetic aperture radar, and made the further processing to the fictitious wave-field data, that was correlation and synthesizing processing. Specifically, developed the traditional mode of processing that mainly based on profiles into a new method,in which, several apertures synthesis with the measure point as the center, lapse point-by-point, finally, multiple coverage was adopted. In hopes to improves the signal-to-noise ratio, highlight the abnormal, improves the resolution and increases the exploration depth. Through the processing of theoretical model data, verified the effectiveness of this method. The different theoretical model processing suggests that related to enhanced synthesis of useful signal, to improve the signal to noise ratio, resolution enhancement effect. The feasibility and validity of synthetic aperture of transient electromagnetic imaging numerical calculation was demonstrated. [ABSTRACT FROM AUTHOR]