The experiment about explosion venting process of methane-air mixture in linked vessels was conducted.It was compared with the single closed container explosion process.The law of pressure variation in linked vessels and the influence of gas concentration and the way of explosion venting are studied.It was concluded that the maximum explosion pressure usually appeared at the end of the pipe.Vacuum appeared because of pressure vibration in the sphere vessel.The same as single vessel

the explosion pressure was higher when the volume concentration of methane was a little more than stoichiometric ratio comparing with the lower concentration.Two vent ports decreased the maximum pressure in the linked vessels better than only one port.The conclusions provided scientific basis in engineering for safety design of gas explosion venting of linked vessels.