Abstract: This paper presents a novel method, the dynamic electrical impedance tomography (EIT), for water seepage nondestructive testing in a cementitious cylinder. In this work, an EIT measurement system including 16 electrodes was designed to implement adjacent stimulation pattern with current injection and voltage acquisition mode. The Equipotential Back-Projection Method was used to process the original data, and then to image the water seepage situation of the specimen. In order to get the advantages and disadvantages of EIT technology, infrared thermography technology has been investigated and compared. The results show the capabilities of EIT technology for water seepage detection in cementitious material/structures. Moreover, EIT can detect water seepage on the material surface, and image the internal seepage which is not suitable for direct observation. This study is beneficial to the development of nondestructive water seepage testing for cementitious material/structures.