Abstarct: Given the importance of combustion of gases, which is an important issue in the field of production, transmission and operation, the study and prediction of flame behavior and conditions affecting it is very important. Flame behavior in a closed and confined environment is more complex than in an open environment. Therefore, focusing on this process requires special attention. Under certain conditions, if a weak energy source is created as a spark inside the gaseous mixture, a slow flame front is formed and the combustion process begins. As a result of conditions such as turbulence and boundary conditions of the walls, the flame has the ability to change from quiet to turbulent and eventually to explode, which is a destructive and dangerous phenomenon. The process of diffusion of the flame front inside the gas mixture depends on the type of flow and the chemical nature of the gas fuel and the prevailing boundary conditions, which causes various instabilities in the flame front and the speed of propagation of the flame front depends on this. One of the factors intensifying the damage is the existence of numerous obstacles in the path of flame propagation. Due to the presence of obstacles in the flow path created in front of the flame, vortices are produced behind them. These vortices cause the flame surface to become wrinkled and wrinkled, or even, depending on the intensity of the flow turbulence, to cause the flame front to split into smaller fronts. This increases the surface area of the flame and consequently increases the burning rate. Also, with the entry of small-scale vortices into the flame structure (preheating zone or even the reaction zone), the overall thickness of the flame increases and the rate of heat and mass transfer to the preheating zone intensifies. However, the entry of high-velocity vortices into the flame structure, depending on the local strain rate, may also cause the flame to go out. Therefore, it is important to study the effect of barriers on combustion parameters. Therefore, in this paper, the effect of barriers such as perforated plates and porous barriers on the emission of methane and air pre-mixed flame fronts in a closed channel has been studied. For this purpose, a constant volume combustion device was used to perform the combustion test and check the combustion parameters such as flame propagation process, combustion chamber pressure and flame tip velocity and finally the effect of number of obstacles, thickness of obstacles, diameter of obstacles, distance between obstacles and distance The above combustion parameters were measured and recorded from the combustion source. According to the results, the turbulence created in the flow field has increased with the repetition of obstacles so that in the presence of an obstacle, the maximum propagation speed is 8.5 m / s, while with the repetition of obstacles with the same diameter and thickness as It has reached 12.5 meters per second. Also, by reducing the pore size of the perforated plates to 2 mm, due to the reduction of thermal energy inside the chamber, the flame is extinguished after hitting the first perforated barrier. In addition to the diameter of perforated barriers, the thickness of the barriers is also effective in extinguishing the flame, so that in similar conditions, the flame is extinguished after hitting a perforated barrier with a pore size of 3 mm with a thickness of 4 mm. Which was passed after colliding with the same obstacle but with a thickness of 2 mm. In flame extinguishing, two patterns of head on and sidewall extinction can be seen. Spark arrest distance is effective in converting these extinguishing patterns so that by increasing the ignition distance, the head on extinguishing pattern becomes sidewall. To investigate the similarity of the performance of the porous barrier with the perforated barrier, a 2 mm porous barrier with similar material, thickness and porosity was designed and constructed. According to the test results, the 2 mm porous barrier, like the 2 mm perforated barrier, extinguished the flame in different positions of the ignition system. Therefore, porous media with higher pore density have a good performance in flame extinction due to having a larger effective internal surface area for convective heat transfer between the porous medium and the flame. Therefore, it can be used in various industries such as mines, petrochemicals, etc. where the risk of combustion and explosion is high.