γ-ray spectrometry was used to explore the known area of the Liangzhu ancient ruins and, as a result, the response characteristics of the radiogenic anomaly with both high concentration of radioactive elements and high total count rate on the gabarit was obtained. The anomaly width is coincided with that of the gabarit, the anomaly axis is the central location of the gabarit, and the axial strike is the same as that of the gabarit. On such a basis, γ-ray spectrometry was carried out in the unknown area. By comparison with anomaly characteristics of the known area, the location and the width of the gabarit in the unknown area were deduced. The result obtained will surely provide some useful reference for identifying the existing gabarit and its distribution.