Nowadays, due to the expansion of construction and the pursuit of extensive losses of physical, natural and financial damages, such as earthquakes, the use of new materials and methods to increase the quality, increase the useful life and durability of structures and reduce the cost of construction is indispensable. In some cases, such as the bridges, columns of the lower floors of the high buildings, etc. It is difficult to use vibrating machines and vibration of concrete, and it is practically impossible in most cases. In order to solve this problem, self-compacting concrete should be used which will cause complete concrete condensation and elimination of porosity (free space and concrete air), increasing the speed of concrete, reducing the work force and cost of execution, and thus improving the durability and stability of the structure and climbing Mechanical properties and instruments. This type of concrete is produced using extra lubricants and other additives. In self-compacting concrete, due to the need for more dough in the mix plan, the use of high-grade cement is common. For this purpose, to study the properties of the concrete as a fresh fiber and to achieve an optimal percentage of fiber utilization, we used rheological experiments including slump flow, L-box, U-box and J-box and funnel V, and the results of Concrete Rheology experiments The newest fibers are presented in a table and a diagram.