Ground state multiply charged Fen+(n=1—3) ions have been produced by means of two separated crossed laser beams incident upon solid cast ion targets in a Paul ion trap. The decay rate of Fe3+ is measured to be 0.96 s-1 at the ground pressure 3.0×10-7 Pa and the reactive product between Fe3+ and N2 is also obtained under the pressure 1.3×10-5 Pa.