Taizishang slope of Qingjiang Reservoir in Huibei is within the range of atomization rainfall． The authors created the finite element model with ANSYS 10. 0 and used strength reduction FEM to calculate thesafety coefficient of the slope on conditions with no rain，and theatomization rainfall lasting for 0. 2 hours and 0. 4 hours． The results show that the atomization rainfall would decrease the stability of the slope，and with rainfalls increasing，the stability would reduce much more．