Abstract: Coal mine underground reservoir has successfully constructed in Shendong Coal Mine Area in western China,as an original underground engineering str ucture.Safe operation is critical to coal mine underground reservoir.The dam of coal mine underground reservoir,especially artificial dam,is an important part for safe of the engineering.In order to ensure the safety of coal mine underground reservoirs under extreme conditions( such as mine earthquakes,earthquakes,etc.),it is necessar y to conduct seismic safety analysis of artificial dam structures.The artificial dam structure is generally flat. Considering that the damage of the dam structure undermin e earthquake or earthquake conditions is usually shear failure,a creative dam structure-artificial arch dam is put forward to improve the seismic performance of the artifi cial dam,and force of artificial plat and arch dam is analyzed.Using FEM,shear stresses and displacement cloud chart of artificial plat and arch dam is obtained,with diff erent earthquake intensity( 7,8,9 and 10 degree) and same numerical parameters.Weak position safety factors of artificial plat and arch dam are compared and analyze d.The result reveal following: the contact part between artificial dam and coal stratum is weakest of the coal mine underground reservoir; artificial dam is safe in operati on under extreme operating conditions due to the restraint of roof,floor,coal pillar and stratum,as the safety factor of artificial arch dam and artificial plat dam are 22.6 a nd 6.4 when earthquake intensity is 10 degree; the action of the arch causes partial compressive stress in the reaction force of the coal pillar on the artificial dam body, part of the seismic load received by the arch artificial dam body is transferred to the coal pillar dam body,reducing the artificial dam body shear caused by the mine eart hquake,which improves the seismic performance of the arched artificial dam.