In this study, the effect of surface nanocrystalline on the properties of titanium has been investigated. One of the methods for creating a nanocrystalline structure at the material level is ultrasonic cold forging. This method reduces grain size by applying deformation of plastic on the surface and grain splitting. This structural change leads to the improvement of some mechanical and tribological properties of the material. Reduction in grain size to nano-dimensions, increase by about 40% in hardness, decrease by about 25% in friction coefficient, increase by about 30% in fatigue, decrease by about 30% in wear rate, reducing surface roughness, creating high pressure residual stress including results The result of this process is on the surface of various materials. This enhancement of properties can affect the life of the piece and, as a result, make this process cost-effective for industrial applications. Microscopic images of abrasive surfaces indicate a decrease in surface degradation of matter. It can be of great importance in materials such as titanium, which, under wear conditions, have abrasive stiffness. The existence of a gradient of properties from surface to depth is another of the effects of this method on matter. This gradient of properties helps to improve the material's performance under working conditions. Another research method is rolling deep. In this method, using a rotating ball that is applied to the vertical force, it is created in a material with a high depth of trash. Together with the impact, the creation of material-level workmanship also helps to enhance properties. The above mentioned factors increase the co-operation of the parts. Other methods are grinding. By placing samples in a high-speed mill in addition to reducing the process time, the amount of energy transferred to the material increases significantly. This causes a region with high plastic deformation in matter. The grain size changes will be high at the level. This method increases the surface hardness by about 80%. Structural analysis using X-ray diffraction provides a lot of material, including crystalline structure, grain size, strain in matter, preferred texture in matter, etc. key words: Nanocrystalline, cold ultrasonic forging, deep rolling, grinding, surface structure modification, titanium.