The first ~(41)Ca AMS measurement was performed with HI-13 tandem AMS system in the CIAE. At present, the basic method has been established. By using a ~(41)Ca blank sample, 300 nA of CaH_3~- ions fromion source can be obtained. Ions were accelerated with a terminal voltage of 7.8 and Ca~(8+)(E=69.7 MeV) The first ~ (41) Ca AMS measurement was performed with HI-13 tandem AMS system in the CIAE. At present, the basic method has been established. By using a ~ (41) Ca blank sample, 300 nA of CaH_3 ~ ions Ions were accelerated with a terminal voltage of 7.8 and Ca ~ (8 +) (E = 69.7 MeV)