In order to research the detection results of cellular structure using direct current(DC) CT technology, this paper selects a phoenix tree, which stands inside the Anhui University of Science and Technology campus, as the experimental model. Five tree pseudosections were designed by the distribution characteristics of cellular，and the number one had no impact on the cellular, the others were opposite. By arranging the 48 copper electrodes on the tree surface when testing, and collecting 34 592 potential rays on the full field with the instrument of parallel electrical method, and then uniting ray data with supplying electrode coordinates,five colorized contour maps had been established by data inversion of electrical resistivity tomography. The results showed that the resistivity of cellular was more than twice that of the background and readily to be identified from the image of resistivity，and the response effects such as size and morphology were obvious. So it is an effective method to detect the cellular locations inside the forest by DC CT technology.