The gas-chimney is a specially associated structure formed by the hot fluid flow in the sedimentary basin. After it was formed, the gas-chimney is still a special transportation channel to the hot fluid and petroleum with scenal action later. It can affect the petroleum accumulation and generation. This paper deals with the formation mechanism and evolution feature of the gas-chimney through photoelastic simulation experiment and other methods. The main relationship between the gas-chimney and the formation, migration and accumulation of petroleum is approached. The result indicates that the study of gas-chimney could not only predict the distribution of the shallow pools, but also provide the scientific basis for searching for the deep organic and inorganic pools in the petroleum exploration of East China.