Research conclusions:The surrounding rocks of Caishenmiao Tunnel neither produces gas nor have the geological environment to storemuch gas. The gas in rock stratum comes from faraway and is of free state, so in genera,l the gas will not burst out suddently. The gas concentration will lower with the gas release through opens and ventilation.However, attention should be paid to the treatment measures and the danger of the gas and outcome caused by the gas should be known. The measres for gas prevention must be implemented one by one. The gas check and ventilation should be focused on to know the gas concentration in the tunne.l The holing must be conducted in advance while excavation ofworking face to control the gas concentration in the safe range. The gas block should be considered in tunnel strcture design to reduce gas escape asmuch as possible for ensuring the construction and service safety of the tunnel.