We　investigated　a　giant　magnetoresistance　(MR)　effect　of　two-dimensional　electron　gas　systems　subjected　to　a　periodically　modulated　magnetic　field.　It　is　found　that　the　MR　ratio　of　such　a　periodically　modulated　system　shows　strong　dependence　on　the　space　between　the　magnetic　potentials.　With　the　increase　in　the　number　of　periods,　the　maximal　MR　ratio　tends　to　be　enhanced　and　the　peak　of　the　MR　ratio　locates　at　a　specific　relative　Fermi　energy　for　the　given　space　between　magnetic　potentials.　Moreover,　the　maximal　MR　ratio　of　odd-period　configurations　is　always　larger　than　that　of　even-period　configurations.