With finite-differences approach,we investigate electronic properties of 2DEG in periodic magnetic field modulation. It shows that the system exhibits rich band structures with presence of magnetic field. Width of sub-bands becomes narrower as k_y increases,because the greater k_y is the deeper the potential well is. Due to different effective potential in two regions,k_y > 0 and k_y < 0,band structure in two areas are not consistent. More bound states are in the area of k_y > 0. In addition,we study effect on energy band structure of period,distance of magnetic stripes and strength of magnetization.