A study on the types of gas transporting pathway and their influence of large and medium gas fields of China suggests that there are six types of gas transporting pathways, i.e. fault, combination of fault and unconformity, sandbody, combination of fault and sandbody, combination of unconformity and sandbody and unconformity. The most important is the fault transporting pathway, the second is the combination of fault and unconformity, the third is sandbody and combination of fault and sandbody, and the last is unconformity and combination of unconformity and sandbody. The types of gas transporting pathway was influenced by the types of basin, types of structures zone in the basin and the spatial relation of source and reservoir. According to gas reserves, gas-bearing areas and accumulation ages of large and medium gas fields in China, and a calculation of gas accumulation efficiency, gas fields of China are divided into three types of high, middle and low efficiency. Through the analysis of relation between gas accumulation efficiency and types of gas transporting pathway, fault, sandbody and combination of fault and unconformity are considered to have higher gas accumulation efficiency, and are favorable for gas to form large gas fields quickly.