The history of use of masonry materials in the building industry dates back centuries and over the past years. Many methods have been developed to strengthen the masonry walls, which near surface mounting method is one of them. In this method, first, grooves on the wall surface are created, and then the reinforcement elements are inserted into the grooves. In the Thesis, 2.5 mm diameter steel wire was used as a reinforcing element in the near-surface mounted method. The advantages of using steel wires are small dimensions of the wire, reduced damage caused by buckling, less costly and easier to implement than other methods. In order to conduct this research, 14 walls of 920 × 920 mm in size were constructed. These panels were tested in three categories. In the first group, different patterns of steel wire were compared. The results of this group show that the placement of steel wires along the wall diameters will have the best performance in improving the behavior of the walls. In the second group, the optimization of the Diagonal alignment of the wires was investigated. The results of this group also show how the demolition of strengthened masonry walls by near surface mounted method using steel wires, is largely influenced by the amount of steel wire used to reinforce the wall. It was also observed that not using epoxy in the parts of the groove did not have a significant effect on the performance of the wall. In the third group, only one side of the masonry walls was reinforced. The results show that although the reinforcement of only one side of the wall is not as effective as reinforcement on either side of the wall, it also significantly improves the wall's behavior. The set of experiments conducted in this study confirms the success of using steel wires in the near-surface mounted method. This method increases the performance of the wall in cases such as bearing capacity, ductility, energy absorption, and elasticity modulus. In the present study, the load capacity was up to 21 times, the energy absorption rate was up to 52 times, and the modulus of elasticity increased by 18 times. This approach provides a solution tailored to the needs of Iran in order to reduce the losses caused by the destruction of residential masonry buildings and reduce the cost of destruction of valuable historical and cultural structures. Keywords: Masonry building, In-plane masonry wall, Diagonal compression loading, Near surface mounted method, Steel wire, NSM, NSM-SW