Abstarct: Prospecting and research of the remaining relics from the past has special importance to identifying the date, history and the identity of a country. Development and the advancement of human knowledge have offered new methods for the detection archaeological sites that by using them without excavation and destruction of the antiquities could be found useful information. Before excavations and drilling, using geophysical methods such as gravimetry and magnetometry is useful for detecting these structures. In the gravity method, the density contrast between the anomalous bodies and the country rocks or around of them has been investigated. By means of magnetic method, magnetization contrast to the surrounding environment with mextal items, building materials and cavities filled with different magnetic materials are investigated. The study aims to identify subsurface structures at the archaeological site of Tepe-Hissar, Damghan using gravimetric and magnetic data. To achieve this goal in a regular grid of square-rectangular, the gravity values at 600 stations and the magnetic values at 1,200 points were measured. After doing correction and processing on the measured data, the anomalies map of gravity and magnetic were prepared. To review and interpret the collected data, the local phase filters were used. So, for evaluating the ability of each of these filters on the field data, baxsed on the features of structures in the Tepe-Hissar sites, a synthetic model of the chambers and walls was prepared by using Potent software and then the gravity and the magnetic value due to this model were calculated. After that, the local phase filters such as tilt angle, theta map, Laplacian, Hyperbola tangent and two new filters named the normalized derivatives ratio and the normalized angle respect to vertical derivative imposed on the data and the results were analyzed. Then these filters were used to detect and interpretation of gravity and magnetic anomalies boundary in Tepe-Hissar. By using the filters on the anomalies, the position of the walls and the ancient chambers were identified. The results of these methods with the results of carried out excavations in the last few decades are highly adaptable. In the other hand, the subsurface structures in areas such as lane, walls or homes confirm the results of gravimetric and magnetic surveys. Since archeology exploration usually investigate by drilling and excavation but using indirect geophysical studies can provide an outline to exploration them. In addition, saving cost and time and to prevent the destruction of the old targets it can be useful.