Based on the comparison with the Earth, using the LB magneticfield model, the distribu- tion of O~+ ion originating from theionosphere in the Martian magnetosphere is theoretically studied un-der different conditions of the tail-like magnetic field. The resultsshow that the Tail-like magnetic field has influence on the O~+ ionflux in the Martian magnetic: (I) the O~+ ion flux in the martiantail will increase if the tail-like magnetic filed increases; whenthe tail-like magnetic field increases from 5 nt to 20 nT, the O~+ion flux increases 3 times in the region of 2.8 R_m in the martiantail; and (II) the O~+ ion flux decreases with increasing intrinsicmoment; when the intrinsic moment increases about 5 times, the fluxdecreases to one fourth in the region of 2.8 R_m in th emartian tail.
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