Abstract: Two experiments have been condueted:the first one is physieal modeling with different borehole diameters,strueture and water (gas)-bearing strata,the another is to study on dynarnic relation between recharge of underground water (gas) and escaped gas. The result show that basic features of escaped gas are abrupt change and burst,thephe-nomenon is caused by alternating process of accumulation and burst,the phenomenon is caused by alternating process of accumulation and release of eseaped gas in flow proecess.In the development process of seismic and geologic events,the accumulation and release of crustal stress and strain may cause that ① Deformation,penetration and damming of channels in migration process of gas of undergroundwater (gas)- bearing strata,② Increasing and decreasing of outflow and veloeity of flow.③ Recharge variation of gas. Burst of eseaped gas has an amplifying effect on the changes mentioned above. Eseaped gas has more sensitive capacity to reflect the earthquakes, which stems to be from the basic nature of gas.

Key words: Eseapedgas, Dynamic feature, Abrupt change, Modeling experiment